# Seals v. Wright Medical Technology, Inc.

> District Court, E.D. Missouri · October 7, 2022

URL: https://www.frixlaw.com/law-library/cases/10237795

## Case

- **Court:** District Court, E.D. Missouri
- **Decided:** October 7, 2022
- **Opinion:** 100trialcourt
- **Cited by:** 0 later opinions in the Frix Law Library

## Citator (automated)

- No negative treatment found by the automated citator. That is not the same as a confirmation that the case is good law; read the citing cases.
- Full citator and citing cases: https://www.frixlaw.com/law-library/cases/10237795

## How later opinions describe it (automated extraction)

- holding that biomedical engineer properly relied on “medical experts’ opinions” as contemplated by Rule 703 in concluding that the defendants’ metal-on-metal hip implant was defectively designed

## Opinion text

UNITED STATES DISTRICT COURT
EASTERN DISTRICT OF MISSOURI
EASTERN DIVISION

WILLIE SEALS, )
)
Plaintiff(s), )
)
v. ) Case No. 4:20-cv-01656-SRC
)
WRIGHT MEDICAL )
TECHNOLOGIES, INC., )
)
Defendant(s). )

Memorandum and Order
Willie Seals had his left hip replaced with a Wright Medical hip implant. Seals later
encountered complications requiring surgery, this time to replace the first implant with another.
Seals claims that Wright Medical’s metal-on-metal hip implant caused him severe injuries;
Wright Medical claims that the FDA approved its at-the-time “state of the art” hip implants, and
that Seals’s doctor was aware of the risks and benefits of metal-on-metal implants when he
selected it. As with most product-liability claims, the parties hired experts to provide various
testimony. In this order, the Court considers Wright Medical’s [60] [62] [64] motions to exclude
Seals’s experts, Seals’s [59] motion to exclude Wright Medical’s experts, and Wright Medical’s
[66] motion for summary judgment.
I. Uncontroverted material facts
In addressing the parties’ Rule 702 motions below, the Court mentions the applicable
facts as proffered by the parties. The Court finds the following facts undisputed for purposes of
summary judgment.
Seals began experiencing pain in his left hip after breaking his pelvis and developing
post-traumatic arthritis due to the fracture. Doc. 78 at ¶ 6. Seals went to an orthopedic surgeon,
Dr. Robert Barrack, for evaluation. Id. Dr. Barrack recommended a total left-hip replacement,
and Seals elected to undergo the surgery. Id. at ¶¶ 7–8.
Dr. Barrack performed Seals’s total left-hip replacement in January 2010. Id. at ¶ 8. In
August 2014, Dr. Barrack and Seals at least discussed the possibility of a revision surgery (a

surgery to remove and replace the original implant) because of Seals’s elevated metal-ion levels
and increasing pain. Id. at ¶ 26. The parties disagree whether Dr. Barrack recommended a
revision surgery at that time or whether Seals and Dr. Barrack agreed to take a wait-and-see
approach. Id. Ultimately, in July 2020, Dr. Barrack performed a revision surgery. Id. at ¶¶ 27–
28.
A hip joint has two main components, the ball and the socket; the ball is the spherical end
of the femur bone, which inserts into the rounded bone structure of the pelvic bone, i.e. the
socket. A hip implant consists of two main components, the head and the socket (consisting of a
shell and liner), which mimic the corresponding bones. See Doc. 78 at ¶¶ 2, 5, 9; Doc. 67-2 at
pp. 6–7. Wright Medical Technology, Inc. manufactured certain lines of hip-replacement

components including the Dynasty, Conserve, and Profemur lines. Id. at ¶ 3. The Conserve
head component and the Dynasty liner component implanted in Seals’s 2010 surgery replace the
natural hip joint. Id. at ¶ 5. Wright Medical made both the Conserve head component and
Dynasty liner component from cobalt chromium metal alloys. Id. at ¶ 5. Thus, the Dynasty and
Conserve products belong to the “metal-on-metal” category of hip prostheses, meaning the metal
head inserts into, and rubs against, the metal socket. Id. at ¶¶ 4-5. The FDA cleared Seals’s hip-
replacement components for commercial distribution before Dr. Barrack implanted them into
Seals. Id. at ¶ 10.
Dr. Barrack testified that at the time of Seals’s initial hip-replacement surgery he (Dr.
Barrack) was aware of risks associated with metal-on-metal hip implants, “such as release of
metal ions, adverse local tissue reactions to metal, elevated ion levels, and pseudotumor reaction
to metal components.” Doc. 78 at ¶ 22; Doc. 67-5 at pp. 9:1–10:4, 22:9–24:1.1

II. Motions to exclude experts
A. Legal Standard
Federal law governs the admissibility of expert testimony in diversity cases. Clark v.
Heidrick, 150 F.3d 912, 914 (8th Cir. 1998). In Daubert v. Merrell Dow Pharmaceuticals, Inc.,
the United States Supreme Court interpreted the then-effective version of Rule 702 of the Federal
Rules of Evidence to require district courts to be certain that expert evidence based on scientific,
technical, or other specialized knowledge is “not only relevant, but reliable.” 509 U.S. 579, 590
(1993). The district court must make a “preliminary assessment of whether the reasoning or
methodology underlying the testimony is scientifically valid and of whether that reasoning or
methodology properly can be applied to the facts in issue.” Id. at 592–93.

Post-Daubert amendments to Rule 702 clarify the standard:
A witness who is qualified as an expert by knowledge, skill, experience, training,
or education may testify in the form of an opinion or otherwise if:

(a) the expert’s scientific, technical, or other specialized knowledge will help the
trier of fact to understand the evidence or to determine a fact in issue;

(b) the testimony is based on sufficient facts or data;

(c) the testimony is the product of reliable principles and methods; and

(d) the expert has reliably applied the principles and methods to the facts of the
case.

1 For ease of reference, the Court uses the page numbers from the CM/ECF header.
Fed. R. Evid. 702; see also Fed. R. Evid. 702 advisory committee’s note to 2000 amendment
(“Rule 702 has been amended in response to Daubert v. Merrell Dow Pharmaceuticals, Inc., and
to the many cases applying Daubert . . . .” (internal citation omitted)).
The Eighth Circuit has fleshed out the Rule 702 standards. Proposed expert testimony

must meet three criteria to be admissible under Rule 702. “First, evidence based on scientific,
technical, or other specialized knowledge must be useful to the finder of fact in deciding the
ultimate issue of fact. This is the basic rule of relevancy.” Lauzon v. Senco Prods., Inc., 270
F.3d 681, 686 (8th Cir. 2001). “Second, the proposed witness must be qualified to assist the
finder of fact.” Id. (citation omitted). “Third, the proposed evidence must be reliable or
trustworthy in an evidentiary sense, so that, if the finder of fact accepts it as true, it provides the
assistance the finder of fact requires.” Id. (internal quotation marks omitted). To meet the third
criterion, the testimony must be “based on sufficient facts or data” and be “the product of reliable
principles and methods,” and the expert must have “reliably applied the principles and methods
to the facts of the case.” Fed. R. Evid. 702(b)–(d).

“Federal Rule of Evidence 702 reflects an attempt to liberalize the rules governing the
admission of expert testimony.” Shuck v. CNH Am., LLC, 498 F.3d 868, 874 (8th Cir. 2007)
(citing Lauzon, 270 F.3d at 686). The rule “favors admissibility if the testimony will assist the
trier of fact.” Clark, 150 F.3d at 915. Doubt regarding “whether an expert’s testimony will be
useful should generally be resolved in favor of admissibility.” Id. (citation and internal quotation
omitted).
Under Rule 702, the trial court has gatekeeping responsibility to “ensur[e] that an
expert’s testimony both rests on a reliable foundation and is relevant to the task at hand.” Kumho
Tire Co. v. Carmichael, 526 U.S. 137, 141 (1999) (citing Daubert, 509 U.S. at 597). “When
making the reliability and relevancy determinations, a district court may consider: (1) whether
the theory or technique can be or has been tested; (2) whether the theory or technique has been
subjected to peer review or publication; (3) whether the theory or technique has a known or
potential error rate and standards controlling the technique’s operation; and (4) whether the

theory or technique is generally accepted in the scientific community.” Russell v. Whirlpool
Corp., 702 F.3d 450, 456 (8th Cir. 2012) (citing Daubert, 509 U.S. at 593–94). “This
evidentiary inquiry is meant to be flexible and fact specific, and a court should use, adapt, or
reject Daubert factors as the particular case demands.” Unrein v. Timesavers, Inc., 394 F.3d
1008, 1011 (8th Cir. 2005). “There is no single requirement for admissibility as long as the
proffer indicates that the expert evidence is reliable and relevant.” Id.
As a general rule “the factual basis of an expert opinion goes to the credibility of the
testimony, not the admissibility, and it is up to the opposing party to examine the factual basis
for the opinion in cross-examination.” Nebraska Plastics, Inc. v. Holland Colors Americas, Inc.,
408 F.3d 410, 416 (8th Cir. 2005) (quoting Hartley v. Dillard’s, Inc., 310 F.3d 1054, 1061 (8th

Cir. 2002)). However, “if the expert’s opinion is so fundamentally unsupported that it can offer
no assistance to the jury, it must be excluded.” Id. (citing Hartley, 310 F.3d at 1061). An expert
opinion is fundamentally unsupported when it “fails to consider the relevant facts of the case.”
Id.
B. Dr. George Kantor
Seals’s expert Dr. George S. Kantor, is a medical doctor and licensed orthopedic surgeon
who, during his 35 years of practice, has performed more than 5,000 total-hip procedures,
including many revision procedures. Doc. 75-1 at pp. 1–4; 28–34. He has been board certified
since 1986 by the American Board of Orthopaedic Surgery.
1. Dr. Kantor’s opinions
Seals retained Dr. Kantor as a medical and orthopedic-surgery expert. Doc. 75-1 at p. 5.
In his report, Dr. Kantor “provide[d] fact and/or opinion testimony regarding the concept,
development, design and performance of the [metal on metal] bearing surfaces, including those

manufactured by Wright Medical, Inc.” Id. He also “[gave] general opinions regarding
damages and/or injuries that may occur due to metal on metal bearing surface failures and toxic
metal ions generated by total hip arthroplasty systems,” including “metal ions generated by
biochemical and mechanical interactions from modular junctions.” Id.
2. Wright Medical’s motion to exclude
Wright Medical moves under Rule 702 to exclude Dr. Kantor’s opinions that its Dynasty
devices are defectively designed and the devices’ Instructions for Use are inadequate, and his
opinion regarding “metal toxicity.”
a. Dr. Kantor’s design-defect opinions
Wright Medical argues that Dr. Kantor’s opinion that the Dynasty metal-on-metal devices

are defectively designed “stem[s] from Dr. Kantor’s overarching premise that all metal-on-metal
devices are defectively designed.” Doc. 63 at p. 10 (citing Doc. 63-2 at p. 19). Wright Medical
asserts that “Dr. Kantor has not made any attempt to connect this overbroad conclusion to the
facts of this particular case, or the specific design of the products at issue.” Id. Wright Medical
further argues that “Dr. Kantor has reviewed essentially nothing specific to the [Dynasty] devices
at issue to substantiate” his opinion. Id.
Wright Medical attempts to make much of the fact that, in a multidistrict litigation, a
court allowed Dr. Kantor to offer a general opinion that all metal-on-metal devices are
defectively designed yet excluded Dr. Kantor’s opinion about a particular implant. Doc. 63 at p.
11 (citing In re Biomet M2a Magnum Hip Implant Prod. Liab. Litig., No. 3:12-MD-2391, 2017
WL 10845178, at *17 (N.D. Ind. Dec. 21, 2017)). However, Wright Medical does not identify
what Dr. Kantor’s device-specific opinions were in that case. See id. The Court notes that the
Biomet MDL court stated that Dr. Kantor did not identify “how the [specific] products share the

problems of other devices.” Id. at *17. Here, Dr. Kantor proffers the opinion that Wright
Medical’s metal-on-metal devices are defectively designed because of their metal-on-metal
articulation. Doc. 63-1 at p. 23.
In a Biomet hip-implant case remanded to this Court from the MDL, the undersigned
found that Dr. Kantor’s similar opinion regarding metal-on-metal implants satisfied the
requirements of Fed. R. Evid. 702, and permitted his testimony. See Bayes v. Biomet, Inc., No.
4:13-CV-00800-SRC, 2020 WL 5095346, at *8 (E.D. Mo. Aug. 28, 2020); id. at Doc. 314
(Kantor trial testimony). As in Bayes, the Court does not find Dr. Kantor’s opinion “so
fundamentally unsupported that it can offer no assistance to the jury.” Synergetics, Inc. v. Hurst,
477 F.3d 949, 956 (8th Cir. 2007) (quoting Bonner v. ISP Techs., Inc., 259 F.3d 924, 929–30

(8th Cir. 2001)).
b. Dr. Kantor’s opinions regarding instructions for use
Wright Medical argues that Dr. Kantor’s opinions regarding the warnings in the
Instructions for Use at issue “are nothing more than ipse dixit and guesswork,” because it claims
he did not review the specific Instructions at issue. Doc. 63 at p. 15; Doc. 84 at p. 8. Seals
responds that Dr. Kantor previously reviewed the Dynasty Instructions for Use, obviating the
need to re-review them before his deposition in this case. Doc. 75 at p. 9.
When asked at deposition whether he had “reviewed documents specific to the Dynasty
metal-on-metal product from Wright Medical,” Dr. Kantor stated that he had, and further
explained that he had reviewed the “Instructions for Use, as well as surgical data provided to
surgeons.” Doc. 75-3 at p. 9:22–11:4. Dr. Kantor also explained what specific information he
believed should have been included in the Instructions for Use in 2010. Doc 75-3 at pp. 21:25–
26:23.

The Court agrees with Seals that any argument regarding when Dr. Kantor reviewed the
Instructions for Use goes to weight rather than admissibility—and Wright Medical may certainly
cross-examine Dr. Kantor on that basis. Wright Medical makes much of the fact that Dr. Kantor
could not identify the specific Instruction for Use he was referring to, arguing that “there were
different versions of Wright’s [Instructions for Use], updated at different times, that
accompanied the devices” implanted in Seals. Doc. 84 at p. 7. However, Wright Medical does
not argue that the information Dr. Kantor stated was missing from the Instructions was actually
in them, and the Court does not find Dr. Kantor’s opinions regarding the instructions “so
fundamentally unsupported that it can offer no assistance to the jury.” Synergetics, 477 F.3d at
956 (quoting Bonner, 259 F.3d at 929–30); see also In re Biomet, 2017 WL 10845178, at *18

(concluding that Dr. Kantor’s opinion regarding instructions for use was admissible because it
compared facts in evidence with the content in the instructions).
Wright Medical also argues that Dr. Kantor’s opinions regarding the Instructions are
unhelpful to a jury because they merely re-assert his design-defect opinions. Doc. 63 at pp. 15–
16. During Dr. Kantor’s deposition, Wright Medical asked: “Are you basically saying it doesn’t
matter what [the Instructions for Use] say, unless it says don’t use this product, the [Instructions
for Use] are inadequate?” Doc. 63-2 at p. 26:16–20. Dr. Kantor answered: “The [Instruction for
Use] is inadequate. The product is defective.” Id. However, when asked to clarify why the
instructions at the time of Seals’s surgery were inadequate, Dr. Kantor explained that the
Instructions failed to warn about the danger posed by introducing—without clinical trials—
second-generation metal-on-metal systems without fully understanding the failures of first-
generation metal-on-metal systems. Doc. 63-2 at pp. 26:21–28:23.
As explained below, the Court grants Wright Medical’s summary-judgment motion on

Seals’s failure-to-warn claim, but reserves ruling on Wright Medical’s summary-judgment
motion regarding punitive damages, an issue on which Dr. Kantor’s explanation may be relevant.
Accordingly, while the Court denies Wright Medical’s motion to exclude Dr. Kantor’s opinions
regarding the Instructions for Use, the Court will not permit testimony from Dr. Kantor—or any
other witness—regarding the adequacy of Wright Medical’s Instructions for Use absent a
showing of admissibility on some claim or defense still at issue. See Fed. R. Evid. 401.
c. Dr. Kantor’s opinions regarding toxicity
Third, Dr. Kantor offers “general opinions regarding damages and/or injuries that may
occur due to metal on metal bearing surface failures and toxic metal ions generated by total hip
arthroplasty systems.” Doc. 63-1 at p. 4. Wright Medical argues that the Court must exclude Dr.

Kantor’s opinions related to metal toxicity because “Dr. Kantor is not a toxicologist.” Doc. 63 at
p. 16. Wright Medical says that Dr. Kantor’s lack of credentials in toxicology, combined with
his statement that “[a] high school chemistry student would understand” that metal ions are toxic,
shows that his metal-toxicity opinions are “not ‘rooted in medical knowledge.’” Id. at p. 17
(quoting Jones v. Lincoln Elec. Co., 188 F.3d 709, 723–24 (7th Cir. 1999)).
Wright Medical’s arguments on this point misstate the record. Dr. Kantor did not simply
offer the opinion that “[m]etal ions are toxic.” Doc. 63 at p. 17. He discussed Seals’s medical
records and compared Seals’s ion levels to “well accepted base line values.” Doc. 75-1 at p. 24.
He also relied on reports by Dr. Baker, a nuclear radiologist. Id. at p. 25.
Dr. Kantor is not a toxicologist, but that does not preclude him from testifying on the
effects of metal toxicity on orthopedic systems. Rule 703 permits an expert to rely on facts and
data that an expert in the particular field would reasonably rely upon, including the opinion of
another expert. See Nicholson v. Biomet, Inc., 46 F.4th 757, 765–66 (8th Cir. 2022) (holding that

biomedical engineer properly relied on “medical experts’ opinions” as contemplated by Rule 703
in concluding that the defendants’ metal-on-metal hip implant was defectively designed); Sosna
v. Binnington, 321 F.3d 742, 746 (8th Cir. 2003) (citing Arkwright Mut. Ins. Co. v. Gwinner Oil,
Inc., 125 F.3d 1176, 1182 (8th Cir. 1997)); see also Dura Auto. Sys. of Indiana, Inc. v. CTS
Corp., 285 F.3d 609, 613 (7th Cir. 2002) (“[I]t is common in technical fields for an expert to
base an opinion in part on what a different expert believes on the basis of expert knowledge not
possessed by the first expert.”). Cf. Fed. R. Civ. P. 703 advisory committee’s note to 1972
proposed rules and note to 2000 amendments. The Court finds that Dr. Kantor did so here.
The Court finds that Wright Medical’s criticism of Dr. Kantor’s toxicology opinions goes
to weight, rather than admissibility. Synergetics, 477 F.3d at 955 (quoting Bonner, 259 F.3d at

929). Wright Medical may cross-examine Dr. Kantor regarding the factual basis for his opinion.
In sum, the Court denies Wright Medical’s motion to exclude Dr. Kantor’s opinions.
C. Dr. Francis Gannon
Seals’s expert Dr. Francis H. Gannon is a medical doctor who has practiced pathology for
over 25 years. Doc. 61-3 at pp. 2–3. He is board certified in anatomic pathology, which
involves the study of tissue in clinical medicine practice and research. Doc. 74 at p. 1 (citing
Doc. 61-1 at p. 23:5–6).
1. Dr. Gannon’s opinions
In his report, Dr. Gannon opined that Seals “experienced an adverse reaction to metal
debris as a result of wear from metal to metal contact in the implanted hip components.” Doc.
61-2 at p. 2. According to Dr. Gannon, “[t]his led to accumulation of metal wear debris in and

around the implant site, causing subsequent tissue destruction, bone damage, pain and difficulty
ambulating and eventually leading revision surgery.” Id. Dr. Gannon also stated: “My opinions
herein are to a reasonable degree of medical certainty and are based upon my education, training,
clinical and practical experience, working knowledge of the published medical and scientific
literature over the course of my career, and review and/or examination of medical records,
reports and/or tissue specimens taken from the left hip revision surgery as well as other records
provided to me.” Id. His report contains several pages of technical discussion as well as a list of
“[a]dditional bases and reasons for opinions, including additional supporting opinions.” Id. at
pp. 2–5.
2. Wright Medical’s motion to exclude

Wright Medical moves under Rule 702 to exclude Dr. Gannon’s opinions regarding metal
toxicity, specifically two statements: (1) Dr. Gannon’s statement regarding the “toxic nature of
cobalt and chromium,” Doc. 61-2 at pp. 4–5; and (2) Dr. Gannon’s statement that “cobalt and
chromium [wear] debris is also directly cytotoxic, meaning it will kill the cells in the area,” Doc.
61-1 at p. 35:18–36:3.
Wright Medical argues that Dr. Gannon’s opinions regarding the toxic nature of cobalt
and chromium are out of the scope of Dr. Gannon’s expertise as a pathologist, and that Dr.
Gannon did not employ a reliable methodology in forming them. Doc. 61 at pp. 10–14. In
response, Seals argues that Dr. Gannon “is a medical doctor who reviewed and relied on peer-
reviewed literature to support this proposition.” Doc. 74 at p. 6 (citing Doc. 61-2 at p. 2). The
Court agrees. Though—like Dr. Kantor—Dr. Gannon is not a toxicologist, that fact does not
preclude him from testifying on the effects of metal toxicity on orthopedic systems. Rule 703
permits an expert to rely on fact and data that an expert in the particular field would reasonably

rely upon, including the opinion of another expert. See Nicholson, 46 F.4th at 765–66; Sosna,
321 F.3d at 746 (citing Arkwright Mut. Ins. Co., 125 F.3d at 1182); see also Dura Auto., 285
F.3d at 613. Cf. Fed. R. Civ. P. 703 advisory committee’s note to 1972 proposed rules and note
to 2000 amendments. The Court finds that Dr. Gannon did so here.
The Court finds Wright Medical’s criticism of Dr. Gannon’s opinions goes to weight,
rather than admissibility. Bonner, 259 F.3d at 929. Wright Medical may cross-examine Dr.
Gannon regarding the factual basis for his opinion. However, the Court denies Wright Medical’s
motion to exclude Dr. Gannon’s opinions at this “gatekeeping” stage.
D. Dr. Stephen Li
Seals’s expert Dr. Stephen Li is a biomechanical engineer who holds a Ph.D. in chemistry

and has testified before the FDA multiple times regarding metal-on-metal implants. Doc. 76-3 at
pp. 2–3. Seals retained Dr. Li “as an expert in the fields of biomedical engineering, particularly
regarding the materials, design, testing, and clinical results of hip implants.” Doc. 76-2 at p. 2.
1. Dr. Li’s opinions
In his report, Dr. Li summarized and provided the basis for his opinions, and stated that
they were “within a reasonable degree of engineering and scientific certainty.” Doc. 76-2 at p. 3.
Dr. Li provided a twenty-nine-point summary of his opinions (and facts supporting those
opinions). Id. at pp. 3–4. The Court includes some, but not all, of Dr. Li’s twenty-nine
summarized bullet points here. Dr. Li opined that Seals’s Wright Medical hip-replacement
device “was defective in design and unreasonably dangerous because of the metal-on-metal
articulation,” and that “Wright Medical did not adequately warn of the dangers” of the device
“due to the defective [metal-on-metal] design.” Id. at p. 5. Dr. Li also provided an opinion on
the issue of wear in hip replacements, explaining that “[i]n a [metal-on-metal] hip implant, there

are two forms of wear, particulate debris and metal ions which cause severe adverse reactions
that require revision surgery.” Doc. 65-1 at pp. 10–15. Dr. Li also opined that Seals’s “implant
failed due to adverse reaction to the metal debris . . . and ions created by his [metal-on-metal] hip
replacement.” Doc. 65-1 at p. 4. Dr. Li stated that Seals’s blood metal ion levels were “more
than 20X normal,” and that “[t]he clinical consequences of [adverse reaction to metal debris]
suffered by Mr. Seals included pain, osteolysis (bone loss requiring bone graft), tissue necrosis,
pseudotumor and effusion.” Id.
2. Wright Medical’s motion to exclude
Wright Medical moves under Rule 702 to exclude Dr. Li’s opinion that its Dynasty hip-
replacement devices are defectively designed; his opinions regarding metal wear and its relation

to Seals’s need for revision surgery; and his opinions regarding what Wright Medical
characterizes as “medical causation” and “metal toxicity.” The Court addresses each in turn.
a. Li’s design-defect opinions
First, Wright Medical argues that Dr. Li’s design-defect opinions are unreliable because
they are “based on virtually no facts or data that actually relate to the design of the [Dynasty]
devices.” Doc. 65 at pp. 8–12. Wright Medical specifically seeks to exclude Li’s opinion that
“[t]he Wright Medical Conserve A Class Total Femoral [Metal-on-Metal] Hip Replacement was
defective in design and unreasonably dangerous because of the metal-on-metal articulation.”
Doc. 65 at pp. 8–9. Wright Medical also objects to Dr. Li’s opinion that its Dynasty devices
“produced increased metal wear compared to other available products,” but does not identify the
part of Dr. Li’s report to which the latter refers. See Doc. 65 at pp. 8–9.
Wright Medical points to Dr. Li’s admission that he did not review internal Wright
Medical documents, such as design-development files or manufacturing records specific to the

devices at issue in this case. Doc. 65 at p. 10. Wright Medical claims that the documents Dr. Li
did review consisted of “extremely limited high-level summaries and marketing pieces available
publicly,” which Wright Medical claims “provide no specific design or manufacturing
specifications at all.” Id. “In short,” Wright Medical argues that “Dr. Li reviewed essentially
nothing specific to the [Dynasty] devices at issue in reaching his conclusion that they are
defectively designed.” Id. at p. 11. Wright Medical also argues that Dr. Li cannot overcome his
failure to consider specific facts by “asserting that the [Dynasty] devices are defectively designed
because all metal-on-metal devices are defectively designed,” because “such a conclusion
requires too great an analytical leap to survive a Rule 702 challenge.” Doc. 65 at p. 11.
Wright Medical argues that the Court should adopt the reasoning from In re: Biomet,

where the court allowed Dr. Kantor to testify regarding “design problems and risks associated
with metal-on-metal devices generally,” but excluded his device-specific opinions as unreliable,
concluding that “the record doesn’t demonstrate that Dr. Kantor considered sufficient data in
developing his opinion on the risks associated with and the design defects of Biomet devices
specifically . . . .” 2017 WL 10845178, *17.
In response, Seals argues that Dr. Li’s opinion is that Wright Medical’s device is
defective “because of the metal-on-metal articulation.” Doc. 76 at p. 6. And “by opining that all
[metal-on-metal] devices are deficient,” Seals argues that “Dr. Li necessarily offers that opinion
about [Wright Medical]’s device as well.” Id. Seals claims that the following sections of Li’s
report provide “ample support” for this opinion:
• “Historical information about how [metal-on-metal] devices failed initially, and
then were re-introduced into the market without sufficient testing” (citing Doc.
76-2 at p. 4, ¶¶ 7–12);
• “The FDA’s decision that a [metal-on-metal] implant should never be a first-
choice treatment, along with subsequent publications detailing the dangers
associated with [metal-on-metal] implants” (citing Doc. 76-2 at p. 4, ¶¶ 14–16);
• “An explanation as to how the smaller particles of metal, as compared with
polyethylene, create more lost particles, which in turn leads to osteolysis” (citing
Doc. 76-2 at p. 5, ¶¶ 19–20); and
• “Information that metal connections are a source of metal ions and debris from
corrosion and wear-related mechanisms.” (citing Doc. 76-2 at p. 5, ¶ 23).

Doc. 76 at p. 6.
Seals adds that Dr. Li testified during his deposition that “the metal-on-poly [implant] has
always been the best option for every patient. I can’t think of a situation where another bearing
surface would be preferred.” Doc. 76 at p. 7 (quoting Doc. 76-1 at pp. 19:21–20:3). Seals also
points out that in Bayes v. Biomet, the Court noted that the “[p]laintiffs’ criticism of metal-on-
metal hip implants is criticism of a particular design choice,” and denied summary judgment for
the defendant on the plaintiffs’ failure-to-warn claim because “[w]hether metal-on-metal
articulation in hip implants is always unreasonably dangerous is a disputed question of fact.”
2020 WL 5095346, at *12.
The Court agrees with Seals that Dr. Li provided sufficient support for his design-defect
opinions. And in opining that Wright Medical’s device, like all metal-on-metal devices, is
defective “because of the metal-on-metal articulation,” Doc. 76 at p. 6, the Court finds that Dr.
Li did not “fail[] to take into account a plethora of specific facts”; thus, his design-defect
opinions are not “so fundamentally unsupported that [they] can offer no assistance to the jury.”
Nebraska Plastics, 408 F.3d at 416–17. Accordingly, the Court denies Wright Medical’s motion
to exclude Dr. Li’s design-defect opinions.
b. Dr. Li’s opinions regarding metal wear
Second, Wright Medical argues that Dr. Li’s design-defect opinions regarding metal wear

at pages 22–27 of his report (Doc. 65-1 at pp. 10–15) are the product of unreliable methodology
and “lack fit with this case.” Doc. 65 at pp. 12–16.
Wright Medical argues that Dr. Li’s opinions regarding metal wear are unreliable because
they are based on a “series of assumptions” and “are not appropriately tied to the facts of this
case.” Doc. 65 at p. 14–16. Seals responds by arguing that at pages 22–27 of his report “Dr. Li
does not purport to be identifying a precise amount of wear that will occur in a [metal-on-metal]
implant; he is simply making the case that [metal-on-metal] devices release substantially more
particles due to wear than polyethylene devices, which, in turn makes them more dangerous.”
Doc. 76 at p. 10 (citing Doc. 76-2 at pp. 23–28).
The Court notes that Wright Medical does not move to exclude other sections of Dr. Li’s

report regarding his observation of the wear in Seals’s retrieved device components, or Dr. Li’s
opinion that the “retrieved components exhibited signs of metal wear and corrosion that are
consistent with the presence of [adverse reaction to metal debris].” Doc. 76-2 at p. 5, ¶ 26; see
also id. at p. 50 (“The amount of wear was typical for a metal-on-metal hip replacement and
represents the significant amount of metal wear that occurs.”).
The Court agrees that Dr. Li’s opinions at pages 22–27 of his report (Doc. 76-2 at pp. 23–
28) regarding the wear rate of metal-on-metal implants is relevant to his “using any metal-on-
metal hip replacement is really a terrible idea” opinion. Doc. 76 at p. 7. Further, the opinions
are not merely based on a “series of assumptions,” as Wright Medical claims. Doc. 65 at p. 14.
Rather, the Court agrees with Seals that Dr. Li provides sufficient support from scientific
literature for his wear-rate opinions. See Doc. 76 at p. 10 (citing Doc. 76-2 at pp. 23–28).
Wright Medical may cross-examine Dr. Li regarding the factual basis of these opinions, but the
Court denies Wright Medical’s motion to exclude them as irrelevant or unreliable. See Nebraska

Plastics, 408 F.3d at 416.
c. Dr. Li’s opinions regarding medical causation and toxicology
Third, Wright Medical argues that the Court should exclude Dr. Li’s opinions on medical
causation and the effects of metal ions in the body, because those opinions are outside his area of
specialized knowledge. Doc. 65 at pp. 17–19. Wright Medical specifically identifies two
medical-causation opinions in Li’s report: (1) “Mr. Seals [sic] implant failed due to adverse
reaction to the metal debris (ARMD) and ions created by his [metal-on-metal] hip replacement”;
and (2) “in just over 2 years from receiving his hip replacement [Seals] began to experience
complications due to production of metal debris and ions from the implants.” Doc. 65-1 at pp. 4,
21. Seals concedes that Dr. Li “does not have the expertise to give medical causation opinions”

and “will not testify about the clinical impacts of the device on Mr. Seals.” Doc. 76 at pp. 12–
13. Accordingly, the Court will not permit Dr. Li to opine on the medical causation of Seals’s
injuries. See Bayes v. Biomet, Inc., No. 4:13-CV-00800-SRC, 2020 WL 5594059, at *6 (E.D.
Mo. Sept. 18, 2020) (citations omitted) (granting motion to preclude biomechanical-engineering
expert from opining on medical causation).
As to “metal toxicity,” Wright Medical argues that, given Dr. Li’s “lack of specialized
knowledge to offer opinions on issues of toxicology,” the Court should exclude Dr. Li’s
“opinions on purported effects of metal particles and metal ions in the body stemming from the
wear of metal-on-metal devices like those at issue, and the effects of those ions in Plaintiff
specifically.” Doc. 65 at pp. 17–19 (citing Doc. 65-1 at pp. 4, 11, 16).
Among other arguments, Seals relies on In re Biomet, where the court allowed Dr.
Truman, plaintiffs’ biomedical expert, to opine that metal-on-metal devices can cause “elevated

metal ions with immune response complications . . . and tissue necrosis.” 2017 WL 10845178,
at *14. Citing Rule 703, the court concluded that “[Dr.] Truman can’t testify as an expert on the
clinical effects of metal ions, but she can permissibly rely on other experts’ opinions that metal
ions cause clinical effects to support her opinion that metal-on-metal devices are unreasonably
dangerous.” Id. at *15. Seals urges the Court to reach the same conclusion here. Doc. 76 at p.
14.
The Court agrees with Wright Medical that In re Biomet does not “stand for the
conclusion that the engineering expert herself could provide her own, independent opinions on
the plaintiff’s actual condition resulting from such devices . . . .” Doc. 85 at pp. 14–15. Dr. Li
may not offer his own independent opinions regarding the clinical effects of metal particles or

ions. But as in In re Biomet, 2017 WL 10845178, at *14, Dr. Li’s report shows that the opinions
at issue support one of his “central conclusions”—that “using any metal-on-metal hip
replacement is really a terrible idea . . . .” Doc. 76-1 at p. 18:3–8. And in his report, Dr. Li
includes numerous footnotes detailing the literature he relied on. See Doc. 76-2 at pp. 9–31. Dr.
Li may rely on those opinions under Rule 703 to support his opinions regarding the risks of
metal-on-metal devices generally, but other limitations apply.
In addition to permitting Dr. Li to “explain why [metal-on-metal] devices present a risk
to patients generally,” Seals argues that the Court should allow Dr. Li to “cite Mr. Seals’s
medical records to the extent that the information therein supports his larger opinions . . . .” Doc.
76 at p. 15. For example, Seals argues that while “it will be up to a medical expert to explain the
ways in which elevated cobalt levels put Mr. Seals’s health at risk,” the Court should allow Dr.
Li to “discuss the extremely high levels of cobalt in Mr. Seals’s body, as evidence that corrosion
from the device affected him.” Doc. 76 at p. 13; see also id. at p. 14 (“In addition to opining

about the general effects of [metal-on-metal] implants, Dr. Li should be permitted to discuss any
details from Dr. Seals’s [sic] presentation that support his opinions. One important example
would that Mr. Seals had 20 times the typical level of cobalt in his blood before his revision
surgery—a sign of the presence of metal ions from the device.” (citing Doc. 76-2 at p. 29)).
Seals again cites In re Biomet, where the court allowed Dr. Truman to opine—based on
other experts’ opinions—that metal ions cause “immune response complications . . . and tissue
necrosis.” Doc. 76 at p. 14 (citing In re Biomet, 2017 WL 10845178, at *14). But that holding
does not support Seals’s argument regarding Dr. Li’s Seals-specific opinions above. The Court
finds that these opinions stray into the realm of medical causation, and as already stated, the
Court limits Dr. Li’s testimony to the risks of metal-on-metal devices generally and will not

permit Dr. Li to opine regarding the medical causation of Seals’s injuries. In sum, the Court
denies Wright Medical’s motion to exclude Dr. Li’s opinions, except as to medical causation.
E. Dr. Lawrence Eiselstein
Wright Medical retained Dr. Lawrence Eiselstein as an expert in materials science. Doc.
73 at p. 4. Eiselstein is a metallurgist and engineer with more than 30 years of experience in the
field of “design and failure analysis.” Doc. 73-2 at p. 4. He received a Ph.D. in materials
science from Stanford University in 1983 and is licensed as a Professional Engineer in California
in the fields of metallurgical engineering and corrosion engineering. Id. at p. 4. His research
includes “the mechanical behavior of materials (strength, fracture, fatigue, wear, and creep),
armor development, corrosion science, and testing as applied to material selection, coating
evaluation, breakdown potential, repassivation, polarization, galvanic, stress corrosion cracking
(SCC), and hydrogen embrittlement issues.” Id.
1. Dr. Eiselstein’s opinions

After receiving Seals’s explanted (i.e. removed during revision surgery) hip-replacement
components, Dr. Eiselstein visually inspected the components and conducted “photo-
documentation, optical microscopy, scanning electron microscopy (SEM) and electron dispersive
spectroscopy (EDS)” analysis. Doc. 73-2 at p. 5. Dr. Eiselstein opined that: (1) the materials
Wright Medical used in the components were “widely accepted as implantable and were
appropriate for this application”; (2) “the products implanted in Mr. Seals were not defective or
defectively designed”; and (3) “Biological material” found in Seals’s “femoral head taper” was
“consistent with possible biological contamination,” which “can lead to suboptimal assembly of
the implant and can negatively affect performance.” Id. at p. 11. In other words, Dr. Eiselstein
opined that Wright Medical properly designed and manufactured the implant, and that

contamination may have occurred due to improper implant assembly during the implant surgery,
which may account for the problems Seals experienced. Id. at pp. 12–13. Additionally, Dr.
Eiselstein commented on Dr. Li and Dr. Kantor’s opinions. Id. at pp. 11–13.
2. Seals’s motion to exclude
Seals moves under Rule 702 to exclude Dr. Eiselstein’s opinions regarding possible
contamination as an alternative explanation for device failure, arguing that Dr. Eiselstein’s
opinions are unreliable and would be confusing to a jury. Doc. 59 at pp. 2–4. The Court
addresses these two arguments in turn.
First, Seals argues that Dr. Eiselstein’s use of “possible,” “could have,” and “may have”
means his opinions regarding potential contamination as an alternative explanation for device
failure “are not issued with any degree of scientific certainty.” Doc. 59 at p. 3. Similarly, Seals
argues that the opinions are unreliable because Dr. Eiselstein “does not offer evidence from

which he can opine whether the contamination existed at the time of implant or whether the
contamination occurred after the device components were removed from Mr. Seals.” Doc. 59 at
p. 3 (citing Barrett v. Rhodia, Inc., 606 F.3d 975, 981 (8th Cir. 2010)).
In Barrett, the Eighth Circuit affirmed the district court’s exclusion of expert testimony
where the expert conceded that “she lack[ed] significant scientific knowledge underpinning [her]
opinion” and “did not rule out alternative causes of [the plaintiff’s] injury prior to forming her
opinion.” 606 F.3d at 981. Noting that the expert’s testimony “was admittedly based on
assumption, without any scientific testing,” the Eighth Circuit stated that “[e]xpert testimony is
inadmissible where, as here, it is excessively speculative or unsupported by sufficient facts.” Id.
Wright Medical responds that because Seals has the burden of proof, Wright Medical

need only convince the jury that the alleged defect did not cause Seals’s injuries. Doc. 73 at p.
11–12. Wright Medical points out that Seals’s experts opine that the metal-on-metal interaction
between the femoral head and acetabular liner was the source of metal ions in Seals’s body, and
that Dr. Eiselstein merely provides an additional or alternate explanation for the source of the
ions. Id. at p. 11.
Wright Medical cites Allen v. Brown Clinic, P.L.L.P, where the Eighth Circuit rejected
the argument that an expert in a medical malpractice case “should have been required to opine as
to an alternative ‘proximate’ cause, not alternative ‘possible’ causes.” 531 F.3d 568, 574 (8th
Cir. 2008). The Eighth Circuit noted that adopting such a rule would preclude a defendant’s
expert from testifying “unless he could conclusively state what proximately caused the injury,”
which “would impermissibly shift the burden of proof and require a defendant to ‘disprove’ a
plaintiff’s theory by a preponderance of the evidence.” Id. Wright Medical accordingly argues
that “Dr. Eiselstein’s use of the words ‘possible,’ ‘could have,’ and ‘may have,’ in his opinion

identifying a potential additional or alternative source of Plaintiff’s metal ion levels does not
provide sufficient grounds to exclude his testimony . . . .” Doc. 73 at p. 12. The Court agrees.
Second, Seals argues that Dr. Eiselstein’s opinions “will confuse a jury because Wright
Medical offers no medical expert testimony or evidence that the implanting surgeon, Dr.
Barrack, breached the standard of care during the implant surgery.” Doc. 59 at p. 3. According
to Seals, before Wright Medical can argue the device failed due to contamination during surgery,
it must offer “expert testimony that the implanting surgeon breached the standard of care by
implanting a contaminated device.” Doc. 59 at p. 3.
Seals relies on Smith v. Tenet Healthsystem SL, Inc., where the Eighth Circuit held that
the district court properly granted judgment as a matter of law for the defendant in a medical-

malpractice case, because the plaintiff failed to offer expert testimony regarding causation. 436
F.3d 879, 888 (8th Cir. 2006)). The Eighth Circuit noted that “[o]ne of the elements of a medical
malpractice claim is causation,” and that “when a party suffers a sophisticated injury . . . expert
testimony is required” to establish causation. Id.
The Court finds that Smith simply does not support Seals’s argument that a defendant in a
defective-medical-device case must offer expert testimony that the implanting physician
breached the standard of care before the defendant can introduce evidence regarding other
potential sources of contamination or device failure. The Court agrees with Wright Medical that
Dr. Eiselstein’s testimony about elements observed in the femoral head taper of the retrieved
device is relevant and helpful to a jury because it tends to show an alternative source of Seals’s
elevated metal-ion levels. Doc. 73 at p. 2. The Court finds that Seals’s criticism of Dr.
Eiselstein’s opinions go to weight, rather than admissibility. Accordingly, the Court denies
Seals’s motion to exclude Dr. Eiselstein’s opinions.

F. Dr. Steven Kurtz
Wright Medical’s expert Dr. Steven Kurtz has been a biomechanical engineer for more
than twenty years, and holds a Ph.D. in Mechanical Engineering from Cornell University. Doc.
73-1 at p. 38. He is also a part-time research professor and Director of the Implant Research
Center at Drexel University’s School of Biomedical Engineering, Science, and Health Systems,
where he supervises a hip- and knee-implant retrieval program. Doc. 73-1 at pp. 6, 28.
1. Dr. Kurtz’s opinions
Dr. Kurtz opines that the use of an alternative metal-on-polyethylene or ceramic-on-
polyethylene implant, with a smaller head size, would have increased the risk of dislocation
compared to Seals’s metal-on-metal implant. Doc. 59-3 at p. 2. Dr. Kurtz also opines that

“[b]ased on the clinical and patient factors in this case, there is insufficient evidence that use of
an alternative bearing would have averted [Plaintiff’s] need for revision surgery.” Id.
2. Seals’s motion to exclude
Seals moves under Rule 702 to exclude Dr. Kurtz’s increased-risk-of-dislocation opinion,
arguing that it is “speculative and not adequately supported by reliable evidence.” Doc. 59 at p.
5. The Court disagrees. In his report, Dr. Kurtz provided ample explanation, supported by
literature, for his opinion that the use of a smaller head increases the risk of dislocation. Doc.
73-1 at pp. 26–27. Essentially, Dr. Kurtz explains that because dislocation in this type of device
requires a combination of force and displacement, increasing the distance the femoral head has to
“jump” to dislocate increases stability and decreases dislocation risk. Id.
Seals also argues that Dr. Kurtz’s opinion “defies reality” because no evidence exists that
Seals has experienced dislocations since he received a ceramic-on-polyethylene replacement

implant in 2020. Doc. 59 at p. 5. But while a lack of displacement since Seals’s revision surgery
may provide a basis for cross-examination, it does not render Dr. Kurtz’s increased-risk-of-
dislocation opinion inadmissible. See Sphere Drake Ins. PLC v. Trisko, 226 F.3d 951, 955 (8th
Cir. 2000) (“Attacks on the foundation for an expert’s opinion . . . go to the weight rather than
the admissibility of the expert’s testimony.”).
The Court also notes that in his reply, Seals argues for the first time that Dr. Kurtz
“cannot opine that a dislocation would even necessarily lead to hip revision surgery,” because
“[Dr.] Kurtz is not a medical doctor.” Doc. 81 at pp. 1–2. As Seals did not raise this argument
in his opening brief, Seals waived it. See Chay-Velasquez v. Ashcroft, 367 F.3d 751, 756 (8th
Cir. 2004).

In sum, as the Court noted when considering a similar challenge to Dr. Kurtz’s opinions
in Bayes v. Biomet, Inc., “[u]nder established Missouri law, a defendant in a design-defect case
“[is] entitled to present evidence . . . of the relative safety of alternative designs.” No. 4:13-CV-
00800-SRC, 2020 WL 5594058, at *10 (E.D. Mo. Sept. 18, 2020) (quoting Moore v. Ford Motor
Co., 332 S.W.3d 749, 768 (Mo. 2011)). Dr. Kurtz has done so here. Thus, the Court denies
Seals’s motion to exclude Dr. Kurtz’s opinions. Having addressed the parties’ respective Rule
702 motions, the Court turns to Wright Medical’s summary-judgment motion.
III. Wright Medical’s motion for summary judgment
Seals’s eight-count Complaint asserts claims against Wright Medical for failure to warn,
design defects, manufacturing defects, breach of warranties, intentional misrepresentation,
negligence, unfair trade practices, and punitive damages. The Court previously dismissed

Seals’s breach-of-warranties, intentional-misrepresentation, and unfair-trade-practices claims
(counts 4, 5, and 7, respectively). Doc. 30. Wright Medical now moves for summary judgment
on all remaining counts of Seals’s Complaint.
A. Legal standard
Rule 56(a) of the Federal Rules of Civil Procedure provides that “[t]he court shall grant
summary judgment if the movant shows that there is no genuine dispute as to any material fact
and the movant is entitled to judgment as a matter of law.” In ruling on a motion for summary
judgment, the Court is required to view the evidence in the light most favorable to the non-
moving party and must give that party the benefit of all reasonable inferences to be drawn from
the underlying facts. AgriStor Leasing v. Farrow, 826 F.2d 732, 734 (8th Cir. 1987). The

moving party bears the initial burden of showing both the absence of a genuine issue of material
fact and entitlement to judgment as a matter of law. Anderson v. Liberty Lobby, Inc., 477 U.S.
242, 250 (1986); Fed. R. Civ. P. 56(a).
In response to the proponent’s showing, the opponent's burden is to “come forward with
‘specific facts showing that there is a genuine issue for trial.’” Matsushita Elec. Indus. Co. v.
Zenith Radio Corp., 475 U.S. 574, 587 (1986) (quoting Fed. R. Civ. P. 56(e)). Self-serving,
conclusory statements without support are insufficient to defeat summary judgment. Armour
and Co., Inc. v. Inver Grove Heights, 2 F.3d 276, 279 (8th Cir. 1993). Rule 56(c) “mandates the
entry of summary judgment, after adequate time for discovery and upon motion, against a party
who fails to make a showing sufficient to establish the existence of an element essential to that
party’s case, and on which that party will bear the burden of proof at trial.” Celotex Corp. v.
Catrett, 477 U.S. 317, 322 (1986).
B. Discussion

1. Failure to warn (count 1)
Seals’s surgeries occurred in Missouri, and the parties agree that Missouri law applies to
the substantive claims in this case. See Doc. 68 at p. 8; Doc. 77 at p. 2. In Missouri, the
elements of a cause of action for strict-liability failure to warn are: “(1) the defendant sold the
product in question in the course of its business; (2) the product was unreasonably dangerous at
the time of sale when used as reasonably anticipated without knowledge of its characteristics; (3)
the defendant did not give adequate warning of the danger; (4) the product was used in a
reasonably anticipated manner; and (5) the plaintiff was damaged as a direct result of the product
being sold without an adequate warning.” Moore v. Ford Motor Co., 332 S.W.3d 749, 756 (Mo.
2011). Causation in a failure-to-warn case requires that the product with the missing warning

cause the plaintiff’s injuries and that a warning would have altered the behavior of the user of the
product. Arnold v. Ingersoll-Rand Co., 834 S.W.2d 192, 194 (Mo. 1992). A rebuttable
presumption applies that “a warning, if provided, will be read and heeded.” Johnson v.
Medtronic, Inc., 365 S.W.3d 226, 232 (Mo. Ct. App. 2012); Grady v. Am. Optical Corp., 702
S.W.2d 911, 918 (Mo. Ct. App. 1985).
In his complaint, Seals claims that Wright Medical owed a duty to warn “all persons
whom [Wright Medical] should have reasonably foreseen may use or be affected by the product,
including, but not limited to, [Seals], [Seals]’s healthcare providers, and the FDA.” Doc. 1 at ¶
89. Wright Medical seeks summary judgment on Seals’s failure-to-warn claim. First, Wright
Medical contends that, under the learned-intermediary doctrine, it had no duty to warn Seals
personally or the Food and Drug Administration of the risks associated with its products.
Second, Wright Medical argues that Seals cannot establish causation because Dr. Barrack had
knowledge about the specific risks about which Seals alleges Wright Medical failed to warn.

The Court agrees that, as relevant to Seals’s failure-to-warn claim, Wright Medical had
no duty to warn Seals directly—or the Food and Drug Administration—of the risks associated
with its products. Missouri courts apply the learned-intermediary doctrine in medical-equipment
or medical-device cases involving failure-to-warn claims. Doe v. Alpha Therapeutic Corp., 3
S.W.3d 404, 419 (Mo. Ct. App. 1999); Kirsch v. Picker Int’l, Inc., 753 F.2d 670, 671 (8th Cir.
1985) (“Missouri law is clear [regarding the learned intermediary doctrine] with respect to
prescription drugs, and these principles apply to x-ray equipment that can be utilized only at the
direction of a physician.” (citation omitted)). Under this doctrine, “a manufacturer of
prescription drugs or products discharges its duty to warn by providing the physician with
information about risks associated with those products.” Doe, 3 S.W.3d at 419. “[A]ny warning

given to the physician is deemed a warning to the patient.” Id. “Thus, [Wright Medical] ha[d] a
duty to properly warn only the doctor of the dangers associated with [its products].” Kirsch, 753
F.2d at 671.
The remainder of Seals’s failure-to-warn claim rests on his allegation that Wright
Medical failed to warn Dr. Barrack of certain risks. Wright Medical argues that Seals cannot
show causation regarding any failure to warn Dr. Barrack because Dr. Barrack knew of the risks
associated with metal-on-metal devices at the time of Seals’s initial hip-replacement surgery,
implanted the device with knowledge of those risks, and warned Seals of the risks that Seals now
alleges materialized and resulted in a revision surgery. Doc. 68 at pp. 16–18.
In support, Wright Medical cites Kirsch, 753 F.2d 670. In Kirsch, the plaintiff alleged
that x-ray treatments using the defendant’s x-ray machines caused skin cancer. Id. at 670. The
Eighth Circuit affirmed a directed verdict in the defendant’s favor on the failure-to-warn claim,
noting that the record contained considerable evidence that the treating physician knew of the

cancer risks associated with radiation treatment. Id. at 672. In light of that evidence, the Eighth
Circuit held that there was “simply . . . no evidence that [the treating physician] did not know of
the danger in using radiation therapy.” Id. at 672. Thus, “[a]ny failure to warn by [the
manufacturer] could not have been the proximate cause of [the plaintiff]’s injuries.” Id.
Wright Medical argues that here, as in Kirsch, Dr. Barrack was “fully aware” of the
specific risks Seals alleges Wright Medical failed to warn about—the risks of metal reactions,
“pseudotumors,” and adverse tissue reactions—and that Dr. Barrack “made a specific decision,
in his medical judgment, to recommend the Wright Medical devices after weighing the relevant
risks and potential complications.” Doc. 68 at p. 18.
Seals does not dispute that Dr. Barrack testified that in 2010 he was aware of risks

associated with metal-on-metal hip implants, “such as release of metal ions, adverse local tissue
reactions to metal, elevated ion levels, and pseudotumor reaction to metal components.” Doc. 78
at ¶ 22; Doc. 67-5 at pp. 9:1–10:4, 22:9–24:1. And Seals does not suggest that the procedural
posture of Kirsch—where the Eighth Circuit reviewed a directed verdict for the defendant on a
failure-to-warn claim—renders that case inapplicable to Wright Medical’s summary-judgment
motion here. See Anderson, 477 U.S. at 250–51, 252 (observing that the summary-judgment
standard under Fed. R. Civ. P. 56 “mirrors” the directed-verdict standard under Fed. R. Civ. P.
50(a), and that the difference is primarily procedural (citation omitted)).
Rather, Seals argues that Kirsch is inapposite because—according to Seals—Dr. Barrack
testified that he was not aware of “(1) the degree of risk associated with metal-on-metal hip
devices” or (2) the increased risk of carcinogenesis (formation of cancer) as a result of “metal
releases from metal-on-metal hip devices.” Doc. 77 at p. 8 (emphasis added). The Court

addresses these two arguments in turn.
First, Seals claims that Dr. Barrack was not aware of the degree of risk “because he now
concedes that metal-on-metal hip devices are no longer used because revision rates and metal ion
releases are too high, and the risks outweigh the benefits.” Doc. 78 at ¶ 22 (citing Doc. 78-7 at
pp. 25:22–26:13; 28:11–20). Wright Medical argues that this testimony does not provide
“evidence that Dr. Barrack was not aware of the degree of risks,” because Dr. Barrack’s
testimony that he no longer uses metal-on-metal devices is not evidence that he would have
made a different decision in 2010—particularly where he “testified that the evolution of new
technology has changed the risk/benefit calculations over time.” Doc. 82 at p. 5 (citing Doc. 78-
7 at p. 33:8–15). The Court agrees.

Second, Seals claims that Wright Medical did not warn Dr. Barrack of the increased
cancer risk associated with “metal releases” from metal-on-metal hip devices. Doc. 78 at ¶ 22
(citing Doc. 78-19). And, during Dr. Barrack’s deposition, he answered “Yes” when asked: “If
there were clinical data or risk analysis done by Wright Medical regarding their metal-on-metal
hips that had determined a risk of [cancer] from the metal, is that something you would have
liked to have known before this surgery?” Doc. 67-5 at pp. 46:19–47:20.
However, as Wright Medical notes, Dr. Barrack went on to testify that “you know, you
have to put that in context,” and “[i]t would only be relevant if it were any different than any
other device.” Doc. 83 at ¶ 49 (quoting Doc. 67-5 at pp. 46:19–47:20). Dr. Barrack continued:
“So if you’re saying that there was an additional risk for this one device that was not present in
other metal-on-metal devices, I would like to know it. I would be surprised if the FDA would
allow it on the market if it were substantially different. But yes, if their device was uniquely
risky, more so than the other devices I was using, I would like to know it, yes.” Doc. 67-5 at p.

47:14–20. However, the evidence Seals puts forward regarding cancer risk—a “risk analysis” of
the Wright Medical “Transcend” metal-on-metal device—does not provide the kind of device-
specific evidence that Dr. Barrack testified he would have wanted to see. See Doc. 78-15 at pp.
2–9.
The Court also agrees with Wright Medical that in any event, because Seals has not
provided evidence that he has been diagnosed with cancer or has a heightened risk of cancer in
the future, Dr. Barrack’s awareness of that risk is not material to this case. See Doc. 82 at pp. 4–
5 (quoting Campbell v. Am. Crane Corp., 60 F.3d 1329, 1332 (8th Cir. 1995) (“[O]ne cannot be
liable for failing to warn of a danger which has not been encountered.”). Thus, both of Seals’s
attempts to differentiate this case from Kirsch fail.

Seals also argues that a dispute of material fact exists regarding whether Dr. Barrack
warned Seals of all the injuries Seals has suffered. Doc. 77 at p. 9. For example, Seals denies
that Dr. Barrack gave him the warnings at the time of Seals’s metal-on-metal implant surgery.
Doc. 78 at ¶ 25. Seals also argues that “Dr. Barrack also testified that he does not remember Mr.
Seals’ surgery, so it is unlikely he can remember the warnings he provided to plaintiff.” Doc. 78
at ¶ 25. But viewed in a light most favorable to Seals, all this shows is that Dr. Barrack may not
have warned Seals—which is not the same as showing that Dr. Barrack was unaware of the risks.
See Kirsch, 753 F.2d at 672 (under Missouri law, “a warning to the doctor is deemed a warning
to the patient” (citing Johnston v. Upjohn Co., 442 S.W.2d 93, 95 (Mo. Ct. App. 1969)); Doe, 3
S.W.3d at 419 (same). In sum, because Dr. Barrack testified that he was already aware of the
risks of Wright Medical’s metal-on-metal devices, the remainder of Seals’s failure-to-warn claim
fails as a matter of law. See id. at 71–72. Accordingly, the Court grants Wright Medical’s
motion for summary judgment as to count 1.

2. Design defect (count 2)
Having moved to exclude the testimony of Seals’s two design-defect experts, Wright
Medical moves for summary judgment on Seals’s design-defect claim “[b]ecause Plaintiff cannot
offer any admissible expert opinion to identify a defect in the design of the devices at issue.”
Doc. 68 at p. 21. In other words, Wright Medical’s motion for stands or falls on the motions to
exclude the testimony of Drs. Kantor and Li. Because the Court denies the relevant portions of
those motions, the Court likewise denies the motion for summary judgment as to Seals’s count 2.
3. Manufacturing defect (count 3)
Wright Medical moves for summary judgment on Seals’s manufacturing-defect claim
(count 3), arguing that Seals has presented no evidence of a manufacturing defect. Doc. 68 at pp.

22–23. Seals does not oppose Wright Medical’s motion for summary judgment on this claim.
Doc. 77 at p. 1. Accordingly, the Court grants the motion as to count 3.
4. Negligence (count 6)
In count 6, Seals alleges that Wright Medical was negligent in the “design, testing,
distribution, manufacture, advertising, sale and marketing of the Conserve.” Doc. 1 at ¶ 149.
Wright Medical argues that Seals’s claim for negligent manufacture fails for the same reason as
his strict-liability manufacturing-defect claim and argues that Seal’s claims of negligent
distributing, advertising, sale, and marketing fail as well. Doc. 68 at pp. 23–24 & n.4. Seals
does not oppose summary judgment on his claims of negligent manufacture, distribution,
advertising, sale, and marketing. Doc. 77 at p. 1. Accordingly, the Court grants summary
judgment for Wright Medical on count 6 to the extent Seals alleged negligent manufacture,
distribution, advertising, sale, and marketing.
Seals opposes Wright Medical’s motion on count 6 as to his claims for negligent design,

negligent failure to warn, and negligent testing. Id. Regarding Seals’s claims of negligent
design and negligent failure to warn, Wright Medical does not offer any argument for summary
judgment on these claims separate from its arguments pertaining to strict-liability design defect
and failure to warn. Presupposing that Seals’s strict-liability claims fail as a matter of law,
Wright Medical believes itself entitled to summary judgment on the related negligence claims.
Doc. 68 at p. 24.
All of these claims—strict-liability design defect, negligent design, strict-liability failure
to warn, and negligent failure to warn—share the same causation elements. See Moore, 332
S.W.3d at 764; Peters v. Gen. Motors Corp., 200 S.W.3d 1, 21 (Mo. Ct. App. 2006). Because
the Court denies Wright Medical’s motion for summary judgment on Seals’s strict-liability

design-defect claim, the Court likewise denies Wright Medical’s motion for summary judgment
on the related negligent-design claim. And because the Court grants Wright Medical’s motion
for summary judgment on Seals’s strict-liability failure-to-warn claim, the Court also grants
Wright Medical’s motion for summary judgment on the related negligent failure-to-warn claim.
Wright Medical also moves for summary judgment on Seals’s negligent failure-to-test
claim, arguing that Missouri law requires a defect in the product to support a negligent failure-to-
test claim. Doc. 82 at pp. 9–11. Presupposing that Court will exclude the testimony of Drs.
Kantor and Li, Wright Medical believes that Seals “cannot establish a defect in the devices at
issue.” Id. at p. 10. However, having denied the motions to exclude the relevant testimony, the
Court rejects this argument. Moreover, a dispute of material fact exists regarding whether
Wright Medical adequately tested its products. See Doc. 78-4 at pp. 14-15 (Dr. Li opining that
Wright Medical brought “its Conserve A-class metal-on-metal hip implants to market without
adequate testing for known dangers.”). The Court thus denies Wright Medical’s motion for
summary judgment on Seals’s negligent-testing claim.
5. Punitive damages (count 8)
Wright Medical moves for summary judgment on Seals’s claim for punitive damages
(count 8). Doc. 68 at p. 24. Seals opposes the motion. The parties disagree whether Tennessee
or Missouri law applies to the punitive-damages claim. See Doc. 68 at pp. 25—28 (arguing
Tennessee law applies); Doc. 77 at pp. 10-11 (arguing Missouri law applies). The Court will
address Wright Medical’s motion for summary judgment as to count 8 separately. The Court
advises the parties that it may, as it did in Bayes, bifurcate the issue of punitive damages.
IV. Conclusion
To the extent set out in this order, the Court grants in part and denies in part Wright
Medical’s [66] Motion for Summary Judgment, except as to count 8, which the Court will
address separately. The Court grants in part and denies in part Wright Medical’s [60] [62] [64]
motions to exclude expert testimony. The Court denies Seals’s [59] motion to exclude expert
testimony.
So Ordered this 7th day of October 2022.
SLR. CL
STEPHEN R. CLARK
UNITED STATES DISTRICT JUDGE

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Source: Frix Law Library, https://www.frixlaw.com/law-library/cases/10237795. Public record. Not legal advice.