Connie J. Thacker v. Ethicon, Inc.; Johnson & Johnson

RECOMMENDED FOR PUBLICATION
Pursuant to Sixth Circuit I.O.P. 32.1(b)
File Name: 22a0203p.06
UNITED STATES COURT OF APPEALS
FOR THE SIXTH CIRCUIT
CONNIE J. THACKER,
Plaintiff-Appellant,
v.
ETHICON, INC.; JOHNSON & JOHNSON,
Defendants-Appellees.
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No. 21-6193
Appeal from the United States District Court for the Eastern District of Kentucky at Lexington.
No. 5:20-cv-00050—Joseph M. Hood, District Judge.
Argued: June 9, 2022
Decided and Filed: August 26, 2022
Before: CLAY, ROGERS, and KETHLEDGE, Circuit Judges.
_________________
COUNSEL
ARGUED: G. Sean Jez, FLEMING, NOLEN & JEZ, LLP, Houston, Texas, for Appellant.
Amy M. Pepke, BUTLER SNOW LLP, Memphis, Tennessee, for Appellees. ON BRIEF: G.
Sean Jez, Gregory D. Brown, Sylvia Davidow, FLEMING, NOLEN & JEZ, LLP, Houston,
Texas, for Appellant. Amy M. Pepke, Susanna M. Moldoveanu, BUTLER SNOW LLP,
Memphis, Tennessee, Charles A. Byrd, BUTLER SNOW LLP, Ridgeland, Mississippi, for
Appellees.
_________________
OPINION
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CLAY, Circuit Judge. Plaintiff Connie Thacker sued Defendants Ethicon Inc. and its
parent company Johnson & Johnson (collectively “Ethicon”) alleging that two medical devices
that Ethicon manufactured caused Thacker to suffer several injuries. She brought strict liability
>

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and negligence claims under the Kentucky Product Liability Act (“KPLA”) alleging design
defect and failure to warn. See Ky. Rev. Stat. § 411.300–411.340. After the close of discovery,
Ethicon moved for summary judgment. The district court granted Ethicon’s motion for summary
judgment on Thacker’s KPLA claims. See Thacker v. Ethicon, Inc., 571 F. Supp. 3d 691, 695
(E.D. Ky. 2021). For the reasons set forth below, we REVERSE the district court’s order and
REMAND for further proceedings.
I. BACKGROUND
A. Factual Background
1. Ethicon’s Pelvic Mesh Devices
This litigation involves two medical devices (the “Pelvic Mesh Devices”) manufactured
by Ethicon. The first is a mesh sling called TVT-Secur. Ethicon introduced the TVT line of
devices in 1998. It developed the TVT-Secur to treat stress urinary incontinence (“SUI”). SUI
“is the involuntary leakage of urine during moments of physical activity that increases abdominal
pressure, such as coughing, sneezing, laughing, or exercise.” (Rosenzweig General Rep.,
R. 225-9, Page ID #10597.) Ethicon launched the second device, a posterior mesh called Prolift,
in March 2005. Prolift was designed to treat pelvic organ prolapse (“POP”). POP “is a
condition in which one or more of the female pelvic organs (bladder, rectum, uterus, and/or
intestines) drop into the vagina to varying degrees . . . to form a bulge or fullness in the vagina.”
(Elliot Rep., R. 225-12, Page ID #12228.) Both devices must be surgically implanted into a
woman’s pelvic walls. When Ethicon distributed the devices, it included a packet of Instructions
for Use (“IFU”) that gave various warnings and disclosures about the devices.
Both devices use a type of mesh called Prolene. Prolene mesh is made of a material
called polypropylene. It was developed in 1974 for use in hernia repairs. Prolene is considered a
“small pore, heavyweight mesh[].” (Rosenzweig General Rep., R. 225-9, Page ID #10616.)
Eventually, Ethicon stopped using Prolene mesh for hernia repairs, but it continued to use it in its
Pelvic Mesh Devices. For the hernia repairs, Ethicon switched to a “large pore, lighter weight
mesh[]” called Ultrapro, which was shown to “minimize the complications seen with
heavyweight meshes like the Prolene” found in the Pelvic Mesh Devices. (Id. at Page ID

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#10606, #10616.) Lighter weight meshes with larger pores were known to be a “superior mesh
design to prevent” certain severe side effects associated with smaller pore meshes like Prolene.
(Id. at Page ID #10623–24.) Ultrapro also contained less polypropylene than the Prolene mesh
used in TVT-Secur and Prolift. Over the years, studies have shown that using polypropylene
mesh in a permanent implant in a woman’s pelvic walls can cause additional side effects
“because of the chemical composition and structure of the mesh.” (Id. at Page ID #10606–07.)
2. Thacker’s Medical History and Treatment
Plaintiff Connie Thacker is approximately 60 years old. In early 2009, Thacker began
seeing a board-certified obstetrician-gynecologist named Dr. Michael Guiler. She reported
symptoms including pelvic pressure, discomfort during intercourse, and frequent and urgent
urination (particularly at night). Dr. Guiler diagnosed her with rectocele1 (a type of POP) and
mild SUI. He recommended surgery to implant the TVT-Secur to treat Thacker’s SUI and
Prolift to treat her rectocele. Dr. Guiler told Thacker that the devices were “something new” and
that they were the “gold standard” and a “good product.” (Thacker Dep., R. 159-4, Page ID
#2891.) On May 8, 2009, Dr. Guiler surgically implanted both devices. Before the surgery,
Thacker reviewed and signed an informed consent form. The form listed several risks of surgery
including: “infections and/or erosions of the mesh” which could require additional follow-up
surgeries; “urinary retention” meaning “the inability to empty the bladder fully;” “[p]ainful
intercourse and vaginal shortening,” although this side effect was said to be “uncommon” and
was rarely permanent; and treatment failure (meaning continued POP and SUI). (Informed
Consent Form, R. 225-8, Page ID #10591.)
After the surgery, Thacker’s incontinence worsened, and she suffered from shooting pain
in her groin area and severe abdominal swelling and bloating. In 2010, Thacker started
experiencing severe and unbearable pain during intercourse (known as dyspareunia). Thacker
reported these problems to Dr. Guiler in a 2012 follow-up appointment, and she also told her
primary physician and a therapist whom she was seeing at the time. Her primary physician sent
her to a specialist, who examined her and told her that some of the mesh from the implanted
1Rectocele is “a condition that occurs when the rectal tissues bulge into the vaginal cavity due to weakened
pelvic floor muscles.” (Def. Statement of Material Facts (“SMF”), R. 159-10, Page ID #3077.)

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Pelvic Mesh Devices “was all bunched up on the left side.” (Thacker Dep., R. 159-4, Page ID
#2897.) The specialist sent her to Dr. Marie Fidela Paraiso at the Cleveland Clinic. Dr. Paraiso
diagnosed Thacker with “[d]ebilitating pelvic pain due to vaginal mesh, severe dyspareunia,
urinary frequency, and urinary dysfunction.” (Rosenzweig Specific Rep., R. 225-4, Page ID
#10421.) On September 27, 2012, Dr. Paraiso revised Thacker’s TVT-Secur sling and removed
a portion of the Prolift device. Without the Prolift, Thacker risked recurrent POP, so Dr. Paraiso
performed a different procedure to correct Thacker’s rectocele. Thacker reported that her pain
and side effects from the Pelvic Mesh Devices worsened after the 2012 surgery. Over the next
several years, Thacker continued to report severe dyspareunia, pelvic pressure, and urinary and
fecal incontinence to her primary physician. Sometime in 2016, she discovered a piece of the
mesh from one of the devices in her urine.
On January 27, 2019, Thacker began seeing Dr. Dionysios Veronikis, who specializes in
female pelvic medicine and reconstructive surgery. Dr. Veronikis recommended surgery to
remove the remaining mesh arms of both the TVT-Secur and Prolift devices. He operated on
Thacker on March 1, 2019, but he was only able to locate and remove the TVT-Secur. He was
unable to locate and remove the mesh arms of the Prolift device. Thacker said that her pelvic
pain decreased after this surgery, but she was still in pain. She continued to struggle with urinary
and fecal incontinence. All said, Thacker claims that the 2009 surgical implantation of the
Pelvic Mesh Devices caused her several injuries including:
Mesh erosion into pelvic floor muscles, pelvic pain, suprapubic pain, vaginal
pain, dyspareunia, recurrent urinary tract infections, voiding [urinary]
dysfunction, incomplete bladder emptying, mixed urinary incontinence, bowel
dysfunction, rectal pain, levator [rectal] spasm[,] and leg pain.
(Rosenzweig Dep., R. 225-3, Page ID #10365.)
3. Dr. Guiler’s Deposition Testimony
Dr. Guiler was deposed more than eleven years after Thacker’s surgery. While most of
his deposition gave details about Thacker’s surgery, he was also asked about his experience with
Ethicon’s Pelvic Mesh Devices. By May 2009, he had performed about 300 surgeries using the
TVT-Secur and 75 to 100 surgeries using the Prolift. Before surgically implanting those devices

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into Thacker, Dr. Guiler did a risk-benefit analysis and concluded that the devices were the best
option for treating her SUI and POP.
Dr. Guiler had learned about the devices through his education, training, and experience;
his personal familiarity with the devices; medical journals and conferences; the IFUs; and input
from other physicians who were doing similar procedures. He testified that he would expect
Ethicon to disclose the severity and probability of certain complications in the IFUs. Had
Ethicon disclosed certain risks, that additional information would have impacted his risk-benefit
assessment for Thacker’s treatment plan. However, he said that he continued to believe that the
TVT-Secur and Prolift were safe and effective treatment options back in 2009, even with the
knowledge he had at the time of his deposition. He did not explain what he had since learned
about the Pelvic Mesh Devices in the years after Thacker’s surgery.
4. Expert Witness Reports and Testimony
The summary judgment briefing included expert reports from two of Plaintiff’s
witnesses: Dr. Bruce Rosenzweig and Dr. Daniel Elliot. Dr. Rosenzweig submitted two expert
reports, one that he created for Thacker’s case (the “specific report”) and one that he produced
for the multidistrict litigation (“MDL”) related to Ethicon’s Pelvic Mesh Devices (the “general
report”). In his specific report, Dr. Rosenzweig opined on both TVT-Secur and Prolift and
offered several conclusions. He opined that: (1) the devices were defectively designed because
the Prolene mesh in both devices created a high risk of severe and permanent injuries; (2)
Ethicon could have used a feasible alternative design by using Ultrapro instead of Prolene mesh;
(3) the devices’ IFUs did not adequately disclose the risks of Prolene mesh; (4) failure to disclose
these risks caused Thacker’s injuries. His specific report incorporated the findings from his
general report, which was about TVT-Secur, and the findings in Dr. Elliot’s report, which was
about Prolift. Dr. Elliot’s expert report, though limited to the Prolift device, similarly concluded
that the device was defective because, inter alia, the Prolene mesh would “degrade, fragment,
and elongate in some patients” leading to “permanent mesh based dyspareunia” and “permanent
pelvic pain.” (Elliot Rep., R. 225-12, Page ID #11278.) Dr. Elliot also opined that Ethicon
“fail[ed] to appropriately warn patients and healthcare providers of the range, severity and
magnitude of the risks and complications” of the Prolift device. (Id.)

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B. Procedural Background
Thacker filed suit in the Eastern District of Kentucky on July 10, 2012. Her amended
short form complaint asserted four KPLA claims against Ethicon: strict liability failure to warn,
strict liability design defect, negligence, and gross negligence.2 See Ky. Rev. Stat. § 411.320.
Pursuant to 28 U.S.C. § 1407, the district court transferred the case to the Southern District of
West Virginia as part of the ongoing MDL over the Pelvic Mesh Devices. See In re Ethicon, Inc.
Pelvic Repair Sys. Products Liability Litig., No. 12-MD-02327 (S.D.W. Va.). But Thacker’s
case lingered on the MDL’s inactive docket for some time.3 As the rest of the MDL wound up,
the MDL court remanded Thacker’s case back to the Eastern District of Kentucky on February
10, 2020. The parties then proceeded with case-specific discovery.
After discovery closed, the parties filed a flurry of motions. Collectively, they filed
roughly fifty motions in limine and motions to exclude. In two of these motions, Ethicon asked
the district court to exclude Dr. Rosenzweig’s and Dr. Elliot’s opinions. Ethicon argued that
Thacker failed to properly designate Dr. Rosenzweig as a general causation expert and that his
opinions were inadmissible under Daubert v. Merrell Dow Pharmaceuticals, 509 U.S. 579
(1993). Ethicon also asked the district court to prevent Dr. Rosenzweig from relying on Dr.
Elliot’s expert report because Thacker had not designated Dr. Elliot as an expert in this case, nor
did she produce his expert report during discovery.
Amongst the avalanche of evidentiary motions, Ethicon also moved for summary
judgment on all of Thacker’s claims. Thacker opposed summary judgment on her four KPLA
claims. The district court granted Ethicon’s motion for summary judgment as to each claim.
See Thacker, 571 F. Supp. 3d at 695. First, it found that Thacker’s failure to warn claim failed
because she had not pointed to any facts showing that any inadequacy in the IFUs proximately
caused her injuries. Id. at 696–702. Second, it held that the design defect claim failed because
2The short form complaint also included several common law tort claims including fraud, unjust
enrichment, negligent infliction of emotional distress, and breach of warranty. Thacker voluntarily dismissed these
claims, and they are not at issue in this appeal.
3Thacker’s case ended up on the inactive docket after the parties informed the MDL court that they had
reached a settlement agreement. But the parties apparently never reached a final agreement, and thus never moved
to dismiss the case.

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Thacker had not produced sufficient evidence showing that there was a feasible alternative
design for the Pelvic Mesh Devices. Id. at 702–07. Finally, it found that her claims for
negligence and gross negligence failed because the two elements that Thacker failed to prove as
to her strict liability claims were also elements of the related negligence and gross negligence
claims. Id. at 702–08. Therefore, Thacker’s inability to show proximate causation (for failure to
warn) and a feasible alternative design (for design defect) doomed both her strict liability claims
and her negligence claims. See id. Notably, the district court refused to consider any arguments
made in the parties’ outstanding evidentiary motions. Id. at 708. Rather, Ethicon was “entitled
to summary judgment even if all [of its] motions to exclude [were] denied and all expert
testimony [was] permitted.” Id. (emphasis added). There was therefore “no need to address the
merits of [those evidentiary] motions.” Id. Thacker timely appealed.
II. DISCUSSION
A. Standard of Review
“We review the district court’s grant of summary judgment de novo.” Kirilenko-Ison
v. Bd. of Edu. of Danville Indep. Schs., 974 F.3d 652, 660 (6th Cir. 2020) (quoting George
v. Youngstown State Univ., 966 F.3d 446, 458 (6th Cir. 2020)). Summary judgment is proper “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.” Fed. R. Civ. P. 56(a). “A dispute of a material fact is
genuine so long as ‘the evidence is such that a reasonable jury could return a verdict for the non-
moving party.’” Kirilenko-Ison, 974 F.3d at 660 (quoting Jackson v. VHS Detroit Receiving
Hosp., Inc., 814 F.3d 769, 775 (6th Cir. 2016)).
“When evaluating a motion for summary judgment, this Court views the evidence in the
light most favorable to the party opposing the motion.” Id. (citing Matsushita Elec. Indus. Co.
v. Zenith Radio Corp., 475 U.S. 574, 587 (1986)). “This includes drawing ‘all justifiable
inferences’ in the nonmoving party’s favor.” Id. (quoting George, 966 F.3d at 458). Moreover,
“[i]n reviewing a summary judgment motion, credibility judgments and weighing of the evidence
are prohibited.” Id. (quoting Biegas v. Quickway Carriers, Inc., 573 F.3d 365, 374 (6th Cir.
2009)). When summary judgment turns largely on factual issues found in an expert report or

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opinion, then those “[e]xpert reports must include ‘how’ and ‘why’ the expert reached a
particular result, not merely the expert’s conclusory opinions.” Automated Solutions Corp.
v. Paragon Data Sys., Inc., 756 F.3d 504, 521 (6th Cir. 2014) (quoting R.C. Olmstead, Inc. v. CU
Interface, LLC, 606 F.3d 262, 271 (6th Cir. 2010)).
B. Analysis
The KPLA “defines a ‘product liability action’ as ‘any action brought for or on account
of personal injury, death or property damage caused by or resulting from the manufacture,
construction, design, formulation, . . . warning, instructing, marketing, advertising, packaging or
labeling of any product.’” Smith v. Wyeth, Inc., 657 F.3d 420, 423 (6th Cir. 2011) (quoting Ky.
Rev. Stat. § 411.300(1) (2010)). The KPLA applies to all product liability claims whether the
claim is based on a theory of strict liability or negligence. Monsanto Co. v. Reed, 950 S.W.2d
811, 814 (Ky. 1997). Thacker brought claims under both of these theories.
1. Strict Liability Claims
The KPLA adopts the strict liability standards set forth in Section 402A of the
Restatement (Second) of Torts (1965). Morales v. Am. Honda Motor Co., 151 F.3d 500, 506
(6th Cir. 1998) (citing Dealers Transp. Co. v. Battery Distrib. Co., 402 S.W.2d 441 (Ky. 1965)).
To make out a strict liability claim, the plaintiff must establish that the product was “in a
defective condition unreasonably dangerous to the user.” Radcliff Homes, Inc. v. Jackson, 766
S.W.2d 63, 68 (Ky. Ct. App. 1989) (citing Restatement (Second) of Torts, § 402A (1965)). A
product can be defective “in a number of ways, including defective design, manufacturing
defects, and a failure to warn.” CertainTeed Corp. v. Dexter, 330 S.W.3d 64, 79 (Ky. 2010)
(citing Clark v. Hauck Mfg. Co., 910 S.W.2d 247, 250 (Ky. 1995), overruled on other grounds
by Martin v. Ohio Cnty. Hosp. Corp., 295 S.W.3d 104 (Ky. 2009)). Thacker brought claims
under two of these theories: failure to warn and design defect.
a. Failure to Warn
The district court erred in granting Ethicon’s motion for summary judgment on Thacker’s
failure to warn claim. In a failure to warn case, “liability for a manufacturer follows only if it
knew or should have known of the inherent dangerousness of the product and failed to

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‘accompany . . . it with the quantum of warning which would be calculated to adequately guard
against the inherent danger.’” CertainTeed Corp., 330 S.W.3d at 79 (quoting Post v. Am.
Cleaning Equip. Corp., 437 S.W.2d 516, 520 (Ky. 1968)). Additionally, the plaintiff must
establish that the failure to warn proximately caused her injuries. Morales, 151 F.3d at 507
(citing Morales v. Am. Honda Motor Co., 71 F.3d 531, 537 (6th Cir. 1995)).
Thacker alleges that the IFUs accompanying the TVT-Secur and Prolift failed to list
certain known complications—such as mesh degradation and deformities leading to lifelong
inflammatory responses—and minimized other known complications by failing to disclose their
“severity, permanency, [or] treatability.” (Rosenzweig Dep., R. 225-3, Page ID #10390–91.)
She argues that she would not have used the Pelvic Mesh Devices to treat her SUI and POP had
the IFUs included sufficient warnings. In response, Ethicon does not argue that the IFUs gave
adequate warnings. Rather, it argues that, even if Ethicon failed to warn of the complications
associated with the Pelvic Mesh Devices, that failure did not proximately cause Thacker’s
injuries.
Kentucky uses the substantial factor test for proximate causation: “was the defendant’s
conduct a substantial factor in bringing about plaintiff’s harm?” Morales, 151 F.3d at 507; see
also CertainTeed Corp., 330 S.W.3d at 77 (quoting Restatement (Second) of Torts, § 431). To
satisfy this requirement, a plaintiff may rely on circumstantial evidence, but “the evidence must
be sufficient to tilt the balance from possibility to probability.” Morales, 151 F.3d at 507
(quoting Calhoun v. Honda Motor Co., 738 F.2d 126, 130 (6th Cir. 1984)). Because this inquiry
involves thorny factual questions, Kentucky courts ordinarily leave questions of proximate
causation to a jury. Id.
In medical device cases, Kentucky applies the learned intermediary rule, which
“provides that a manufacturer’s duty to warn of the foreseeable risks of a medical device is
satisfied if it gives adequate warnings to the patient’s healthcare provider.” Cutter v. Ethicon,
Inc., No. 20-6040, 2021 WL 3754245, at *9 (6th Cir. Aug. 25, 2021) (citing Larkin v. Pfizer,
Inc., 153 S.W.3d 758, 761–65 (Ky. 2004)). Although the learned intermediary rule defines the
manufacturer’s duty, it also shapes the proximate cause analysis. In a run-of-the-mill failure to
warn case, the proximate cause inquiry focuses on the consumer. See Morales, 151 F.3d at 507.

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For example, in Morales, this Court focused on the following question: had a motorcycle
manufacturer added a safety flag on its bikes, would a driver have been able to see that flag and
react in time to prevent an imminent accident? Id. This consumer-specific inquiry does not
neatly transfer to medical device cases where there are more links in the causal chain. In medical
device cases, the causal chain involves the doctor’s reading and relying on the warnings,
conveying that information to the plaintiff, and making an informed recommendation about the
best treatment plan. The plaintiff must then give informed consent to proceed with that
treatment. See Larkin, 153 S.W.3d at 769–70. With this many steps, courts have struggled to
pinpoint what kinds of evidence the plaintiff can or must use to support proximate causation at
the summary judgment stage.
Accordingly, the proximate cause inquiry in medical device cases involves two steps:
(1) did the treating physician rely on the relevant warning (i.e., the IFUs), and (2) would the
evidence allow a jury to conclude that, had the manufacturer given a proper warning, the plaintiff
likely would have followed a different course of treatment (i.e., would not have used the medical
device). See Thacker, 571 F. Supp. 3d at 697–99. As to the first prong, the district court found
that Thacker pointed to sufficient evidence to create a genuine dispute of material fact regarding
whether Dr. Guiler relied on the IFUs. Id. at 698 (citing Sexton v. Ethicon, Inc., 20-cv-282, 2021
WL 4138399, at *3 (E.D. Ky. Sept. 10, 2021)); see also Cutter, 2021 WL 3754245, at *9.
Ethicon does not challenge this finding on appeal. Therefore, the issue before this Court is
whether Thacker has presented evidence showing that she likely would not have used the Pelvic
Mesh Devices had Ethicon given adequate IFUs. We conclude that she has. To reach this
conclusion we must first assess what type of evidence a plaintiff may use to support her
proximate causation arguments.
Both Thacker and Ethicon focus on whether Dr. Guiler would have recommended the
Pelvic Mesh Devices had Ethicon given adequate IFUs. Ethicon argues that a single type of
evidence, testimony from the treating physician, will almost always make or break the proximate
cause determination. According to Ethicon, “where it is undisputed that additional warnings
would not have affected the implanting physician’s treatment decisions, any alleged inadequacy
in the warning is not the proximate cause of the plaintiff’s injury.” (Def. Br. at 31.) Thacker

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disagrees with this narrow approach, arguing that it would allow courts to “ignore[] the record”
and “disregard[] other evidence.” (Pl. Br. at 12.)
Several lower courts have adopted some version of Ethicon’s suggested approach and
limited the proximate cause inquiry to testimony from the treating physician. See, e.g., Mitchell
v. Ethicon, Inc., No. 20-cv-157, 2020 WL 4550898, at *6 (E.D. Ky. Aug. 6, 2020) (“While it
does not appear that any Kentucky court has issued a bright-line rule for causation in this
scenario, many others have required the plaintiff to produce evidence that an additional warning
would have changed the treating physician’s prescribing decision.” (collecting cases)). The
district court adopted this approach and focused solely on Dr. Guiler’s testimony:
[W]hen the defendant . . . present[s] affirmative testamentary evidence that the
doctor would not have changed his course of action with the additional warning,
the plaintiff must present evidence to the contrary in order to show a genuine
issue of material fact exists.
Thacker, F. Supp. 3d at 702 (internal citations omitted) (citing Corder v. Ethicon, Inc., 473 F.
Supp. 3d 749, 758 n.7 (E.D. Ky. 2020); Sexton, 2021 WL 4138399, at *4; Huskey v. Ethicon,
Inc., 29 F. Supp. 3d 736, 743 (S.D.W. Va. 2014)). Such an approach essentially boils the claim
down to the testimony of the treating physician. But Kentucky law does not support such a
narrow approach. See Corder, 473 F. Supp. 3d at 758 n.7 (“Ethicon’s contention is, strictly, that
only proof from or concerning the specific prescribing physician would suffice. Kentucky has
not said that.” (emphasis added)).
Rather, plaintiffs can support their proximate cause arguments with various types of
evidence. For example, plaintiffs may point to evidence suggesting that, with an adequate
warning: the treating physician would not have recommended the device; a reasonable physician
would not have recommended the device; the treating physician (or a reasonable physician)
would have given the plaintiff more information about the severity and likelihood of the risks; or
the plaintiff would not have consented to, or elected to proceed with, the treatment. See, e.g.,
Corder, 473 F. Supp. 3d at 758 n.7, 760; Cutter v. Ethicon, Inc., No. 19-443, 2020 WL 109809,
at *8 (E.D. Ky. Jan. 9, 2020); Clark v. Danek Med., Inc., No. 94-cv-634, 1999 WL 613316, at *5
(W.D. Ky. Mar. 29, 1999) (citing Snawder v. Cohen, 749 F. Supp. 1473, 1479–80 (W.D. Ky.
1990)). In sum, the plaintiff must simply provide “some evidence from which a jury might

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conclude that an adequate warning would have altered the conduct that led to the injury.” Clark,
1999 WL 613316, at *6.
The evidence in this case cuts in different directions. We turn first to Dr. Guiler’s
testimony. On the one hand, Dr. Guiler testified that, assuming the Pelvic Mesh Devices caused
more severe complications than those listed in the IFUs, he would have expected Ethicon to
disclose that information. He explained that, had Ethicon disclosed these risks—such as chronic
pelvic pain and dyspareunia—that information would have affected his risk-benefit analysis
when recommending the Pelvic Mesh Devices to Thacker. Additionally, when asked why he
recommended TVT-Secur and Prolift for Thacker in 2009, Dr. Guiler said that, “At the time, [he]
felt like that was certainly the best options [sic] for her circumstances.” (Guiler Dep., R. 159-2,
Page ID #2826 (emphasis added).) These portions of his testimony suggest that he likely would
have recommended a different course of treatment had Ethicon given adequate IFUs.
On the other hand, Dr. Guiler also testified that, even “with the knowledge [he] ha[d]” at
the time of his deposition, he still believed that the Pelvic Mesh Devices “were safe and effective
treatments for . . . SUI and POP in women” back in 2009. (Id. at Page ID #2832.) Ethicon
argues that this one statement dooms Thacker’s failure to warn claim. However, Dr. Guiler did
not say that he would stand by his recommendation had he received a complete and accurate
IFU. He merely said that he still thought that the Pelvic Mesh Devices were generally safe and
effective. But his testimony did not explain what new information he had since learned. For
instance, he did not say that he had further researched these devices, read newly published
clinical studies, or seen the more recent data showing that these devices had abnormally high
rates of severe complications. (See Rosenzweig General Rep., R. 225-9, Page ID #10612–13
(citing case study where 34 out of 58 Prolene mesh implants had cracked after implantation).)
And there is nothing indicating that, on the day of his deposition, Dr. Guiler was given every
warning that Thacker says should have been included in the IFUs. Since the question is whether
Dr. Guiler would have acted differently with an adequate warning, not whether he would make
the same recommendation with some amount of unidentified new knowledge, this evidence is
not as strong as Ethicon suggests. What is left is a handful of arguably contradictory statements
from Dr. Guiler about how he would have treated Thacker had Ethicon given sufficient IFUs

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back in 2009. Weighing contradictory statements of this nature is a task for the jury, not for this
Court. See Kirilenko-Ison, 974 F.3d at 660. This is particularly true in the medical field, where
treating physicians may have an interest in protecting their professional reputations and
defending past treatment decisions, even if the case is not focused on their standards of care.
The other record evidence supports Thacker’s proximate causation arguments. Thacker’s
expert, Dr. Rosenzweig, testified that no reasonable physician would have used the Pelvic Mesh
Devices to treat Thacker had Ethicon given adequate IFUs in 2009. According to Dr.
Rosenzweig, Dr. Guiler would have made a different treatment recommendation had Ethicon
given him all the necessary information. This evidence creates a genuine dispute of material fact
on the proximate cause element. A jury could hear from both doctors and choose to believe Dr.
Rosenzweig’s opinion that no reasonable doctor, with adequate warnings, would have implanted
Thacker with the TVT-Secur and Prolift. Dr. Rosenzweig’s testimony is “sufficient to tilt the
balance from possibility to probability,” Morales, 71 F.3d at 537 (quoting Calhoun, 738 F.2d at
130), and courts must not weigh competing evidence at the summary judgment stage, Kirilenko-
Ison, 974 F.3d at 660. Thacker therefore produced sufficient evidence to establish proximate
causation at this stage, and the district court erred in granting summary judgment on her failure
to warn claim.
b. Design Defect
The district court also erred in granting Ethicon’s motion for summary judgment on
Thacker’s strict liability design defect claim. “Kentucky applies a risk-utility test in design
defect cases.” Burgett v. Troy-Bilt LLC, 579 F. App’x 372, 378 (6th Cir. 2014) (quoting Toyota
Motor Corp. v. Gregory, 136 S.W.3d 35, 42 (Ky. 2004)). “The test in these cases is ‘whether an
ordinarily prudent company being fully aware of the risk, would not have put the product on the
market.’” Id. (quoting Toyota Motor Corp., 136 S.W.3d at 42). In all cases, “design defect
liability requires proof of a feasible alternative design.” Toyota Motor Corp., 136 S.W.3d at 42.
Ethicon’s only argument against Thacker’s design defect claim is that she failed to
present evidence of a feasible alternative design for the Pelvic Mesh Devices at the time of her
surgery. In response, Thacker points to Dr. Rosenzweig’s opinion that “a product with less

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polypropylene such as Ultrapro [mesh]” was a feasible alternative design for the Prolift and
TVT-Secur,4 which both used the polypropylene-based Prolene mesh. (Rosenzweig Specific
Rep., R. 225-4, Page ID #10478–79.) The district court found that Dr. Rosenzweig’s opinion did
not sufficiently explain why Ultrapro was feasible, and it dismissed his opinion as “a mere
declaration with no support.” Thacker, 571 F. Supp. 3d at 706. On appeal, Ethicon defends the
district court’s conclusion, arguing that Thacker failed to produce evidence showing that
Ultrapro mesh was a feasible alternative design. Ethicon further argues that using Ultrapro
instead of Prolene mesh in the Pelvic Mesh Devices would not have prevented Thacker’s
injuries.
First, Dr. Rosenzweig’s opinion sufficiently supports Thacker’s claim that Ultrapro mesh
was a feasible alternative design that was available at the time. “In establishing a defect in
product design, a plaintiff must show something more than that it was ‘theoretically probable
that a different design would have been feasible.’” Brock v. Caterpillar, Inc., 94 F.3d 220, 224
(6th Cir. 1996) (quoting Ingersoll-Rand Co. v. Rice, 775 S.W.2d 924, 928 (Ky. Ct. App. 1988)).
Rather, a plaintiff must show “that a reasonable alternative design could have been practically
adopted at the time” the plaintiff used the product. Johnson v. Manitowoc Boom Trucks, Inc.,
484 F.3d 426, 433 (6th Cir. 2007) (quoting Martin v. Michelin N. Am., Inc., 92 F. Supp. 2d 745,
753 (E.D. Tenn. 2000)) (emphasis in original). Thacker has done so in this case.
Dr. Rosenzweig’s expert report stated that “based on [his] experience and review of the
medical literature and other materials” he believed that Ultrapro was a “safer and feasible”
design for both the Prolift and TVT-Secur. (Rosenzweig Specific Rep., R. 225-4, Page ID
#10478.) Ethicon argues, and the district court agreed, that Dr. Rosenzweig provided no basis or
explanation for this opinion, and therefore it was not evidence of a feasible alternative design.
Specifically, Ethicon says that Dr. Rosenzweig did “not cite[] any record evidence to support his
opinions on Ultrapro.” (Def. Br. at 26.) This is simply false. In fact, Dr. Rosenzweig cited
several documents, including internal Ethicon emails, about Ultrapro when explaining why
4Dr. Rosenzweig listed three other alternative designs for the Prolift and TVT-Secur. The district court
found that these “three listed alternatives do not qualify as proper alternatives because they are not appropriately
analogous to the mesh products actually used” in Thacker’s surgery. Thacker, 571 F. Supp. 3d at 703. Thacker does
not challenge this finding on appeal, leaving only her argument that Ultrapro was a feasible alternative design.

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Ultrapro was a feasible alternative design. (See Rosenzweig General Rep., R. 225-9, Page ID
#10616 n.41, #10623 n.64, #10629 ns.85–86, #10713–14, #10760.)
Ethicon next argues that Dr. Rosenzweig only gave detailed opinions about TVT-Secur
and not Prolift. Admittedly, Dr. Rosenzweig’s general causation report only addressed TVT-
Secur. But the conclusions in his general report suggest that Ultrapro could have replaced
Prolene mesh (which was used in both devices) to treat both POP (treated with the Prolift) and
SUI (treated with the TVT-Secur). Indeed, Dr. Rosenzweig relied on witness testimony to
conclude that:
[D]espite having incorporated the use of lightweight, large pore Ultrapro mesh in
vaginal tissues for the treatment of pelvic organ prolapse [like rectocele], the
Ultrapro was never used by Ethicon in a device used for the treatment of [SUI]
largely because the company wanted to continue to rely on [older clinical] studies.
(Id. at Page ID #10628–29.) The district court recognized this part of Dr. Rosenzweig’s report,
but it concluded that this statement only “suggest[s that] Ultrapro existed,” and Thacker could
not show that Ultrapro was a feasible alternative “simply because it existed.” Thacker, 571 F.
Supp. 3d at 706. But Dr. Rosenzweig’s expert report says more than that. Indeed, it indicated
that Ultrapro was feasible because it was being used to treat POP and it could easily be used to
treat SUI, but Ethicon chose not to use it for that purpose because it would not be able to use
more favorable (but outdated) clinical studies. Dr. Rosenzweig also explained that the properties
of Ultrapro mesh (i.e., a lighter weight, larger pore mesh using less polypropylene) would have
worked well in the Pelvic Mesh Devices. Accordingly, the evidence in the record would allow a
jury to find that Ultrapro was a feasible alternative design for both the Prolift and the TVT-Secur
at the time of Thacker’s surgery.5
5Ethicon suggests in passing that Ultrapro was not a feasible alternative design because the Food and Drug
Administration (“FDA”) “never cleared Ultrapro for use in the treatment of SUI.” (Def. Br. at 10.) Ethicon
emphasized this argument in its motion for summary judgment. In a lengthy footnote, the district court agreed and
suggested that Kentucky courts would likely side with a minority of courts in Texas that hold that, without FDA
approval, an alternative design is not feasible. See Thacker, 571 F. Supp. 3d at 706 n.4 (citing Pizzitola v. Ethicon,
Inc., No. 20-cv2256, 2020 WL 6365545, at *4 (S.D. Tex. Aug. 31, 2020)). But the district court’s reasoning is
flawed for several reasons. First, it is illogical to say that an alternative design—that, by definition, was never put
on the market—must have been approved by the FDA to support a design defect claim. To require FDA approval
for a design that never came to fruition would likely doom all design defect claims in the medical device context.
Second, the record in this case shows that Ethicon marketed and sold the Prolift device for over three years before it

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Second, Ethicon argues that, even if Ultrapro was a feasible alternative design, Thacker
has not shown that using Ultrapro mesh would have prevented her injuries. Under Kentucky
law, a plaintiff must produce evidence that would allow a jury to find that the alternative design
“would have prevented [the plaintiff’s] injury.” Toyota Motor Corp., 136 S.W.3d at 42 (quoting
Ingersoll-Rand Co., 775 S.W.2d at 929). This principle emerged from cases where an
intervening event led to the injury, such that a different design would not have prevented the
injury. See Jones v. Hutchinson Mfg., Inc., 502 S.W.2d 66, 70–71 (Ky. 1973); Ingersoll-Rand
Co., 775 S.W.2d at 928–29. Nonetheless, lower courts applying Kentucky law have used this
standard in medical device cases even when there is no apparent intervening cause such as
medical malpractice by the treating physician. See, e.g., Sexton, 2021 WL 4138399, at *5;
Dalton v. Animas Corp., 913 F. Supp. 2d 370, 375 (W.D. Ky. 2012) (quoting Cummins v. BIC
USA, Inc., 835 F. Supp. 2d 322, 326 (W.D. Ky. 2011)). However, in medical device cases, an
expert’s opinion that the alternative design would have prevented the injury is sufficient to create
a genuine factual dispute. See Dalton, 913 F. Supp. 2d at 375–76 (denying summary judgment
based on expert opinion on this issue). Thus, the issue is whether the expert evidence in this case
would allow a jury to conclude that using Ultrapro rather than Prolene mesh would have
prevented or lessened Thacker’s injuries.
Both parties point to Dr. Rosenzweig’s statements in support of their respective positions.
Thacker points to his specific report where he opined that using Ultrapro mesh was “capable of
preventing Ms. Thacker’s injuries and damages.” (Rosenzweig Specific Rep., R. 225-4, Page ID
#10479.) Dr. Rosenzweig explained that:
[Thacker’s injuries] were a result of the specific design flaws of the TVT-S[ecur]
and Prolift polypropylene, including degradation, cytotoxicity, stiffness,
migration, deformation, fraying, roping, cording, curling, banding, scarring,
ever received FDA approval. If the allegedly defective device was not even FDA approved when it hit the market, it
defies logic to require FDA approval for the proposed alternative design. Third, there is scant legal support for such
a rule in the case law. See, e.g., In re Ethicon Inc. Pelvic Repair Sys. Product Liab. Litig., 12-MD-2327, 2020 WL
1060970, at *3 (S.D.W. Va. Feb. 13. 2020) (finding that plaintiffs could use evidence of an alternative mesh design
even though that alternative was not approved by the FDA to treat the plaintiffs’ conditions).
However, we need not decide this issue at this time. Although relying heavily on this argument below,
Ethicon provided no argumentation about FDA approval in its appellate brief. Ethicon only mentioned FDA
approval once in the background section. It thus did not preserve this issue on appeal. See Bard v. Brown Cnty.,
970 F.3d 738, 749 (6th Cir. 2020).

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shrinkage/contraction, scar plate formation, chronic inflammation, chronic foreign
body reaction, loss of pore size with tension, dense, heavy, and frayed, rough
edges. If [Ultrapro mesh had] been used for Ms. Thacker, she would not have
suffered the injuries.
(Id. (emphasis added).) In response, Ethicon points to the following portion of Dr. Rosenzweig’s
deposition testimony:
Q: And then, finally, we have got your opinion on the sling or rectocele repair
using Ultrapro?
A: Correct.
Q: And would a rectocele repair or sling with Ultrapro have eliminated the risks
of complications for Miss Thacker that you attribute to her TVT Secur and
Prolift?
A: Eliminate, no.
(Rosenzweig Dep., R. 225-3, Page ID #10393.)
Having found that Thacker did not even identify a feasible alternative design, the district
court did not consider whether Ultrapro would have prevented her injuries. See generally
Thacker, 571 F. Supp. 3d at 702–07. But Thacker points to a nearly identical case—involving
the same type of mesh device, the same expert witness, and even the same district judge—to
support her argument that Dr. Rosenzweig’s expert report is enough to survive summary
judgment on this issue. See Sexton, 2021 WL 4138399, at *6. In Sexton, the plaintiff relied on
an expert report from Dr. Rosenzweig to make an identical argument: Ethicon could have used
Ultrapro mesh instead of meshes with more polypropylene in them when designing its TVT line
of devices. See id. The district court denied summary judgment in that case and found that a
jury could rely on Dr. Rosenzweig’s testimony to conclude that Ultrapro mesh would have
prevented the injury. Id. Specifically, the court held that:
It is arguable that less polypropylene mesh could have resulted in less harm to
Plaintiff than that found in the product used in her treatment. The test is whether
there was a safer design alternative that would have prevented Plaintiff’s injuries
not whether there was a design alternative that eliminated all risks with absolute
certainty. Less polypropylene mesh may have prevented, or at least lessened,
Plaintiff’s injuries. Ethicon may cross-examine Dr. Rosenzweig at trial about . . .
whether less polypropylene mesh would have been safer.

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Id. (emphasis added). This reasoning applies with equal force in this case. At most, the
evidence Ethicon highlights shows that Ultrapro may not have eliminated all risks. But that does
not mean that it would not have prevented or lessened some, or even most, of Thacker’s injuries.
Because a jury could accept Dr. Rosenzweig’s opinion that a feasible alternative design would
have prevented Thacker’s injuries, Thacker has raised a genuine dispute on this prong of her
design defect claim. Therefore, Thacker has raised sufficient evidence to allow a jury to find that
Ultrapro was a feasible alternative design that would have prevented her injuries.
But Ethicon raises a final overarching argument. Perhaps recognizing that it had little
defense against the substance of Dr. Rosenzweig’s opinions, Ethicon spent much of its brief
arguing that this Court should not consider Dr. Rosenzweig’s testimony because it is
inadmissible and unreliable. Admittedly, without Dr. Rosenzweig’s testimony, Thacker would
not be able to point to evidence of a feasible alternative design. However, Ethicon’s evidentiary
arguments are not within the scope of this appeal, and the Court will not entertain them.
After discovery closed, the parties filed a plethora of evidentiary motions, including
Ethicon’s motions to exclude Dr. Rosenzweig’s opinions. Ethicon filed its motion for summary
judgment at the same time. Its motion for summary judgment did not raise any evidentiary
arguments about the expert opinions or reports. For purposes of summary judgment, the district
court assumed that all of Thacker’s expert evidence was admissible. See Thacker, 571 F. Supp.
3d at 708. It therefore denied the evidentiary motions as moot when it granted Ethicon’s motion
for summary judgment. Id. Nonetheless, on appeal, Ethicon raises several arguments from its
evidentiary motions, including that: (1) Thacker failed to properly designate Dr. Rosenzweig as
a general expert; (2) Dr. Rosenzweig improperly relied on and incorporated Dr. Elliot’s opinions;
(3) the expert reports are inadmissible hearsay;6 and (4) Dr. Rosenzweig’s opinion is unreliable
and therefore inadmissible under Federal Rule of Evidence 702(b). Thacker argues that the
Court should not consider these arguments because they were “not made in [Ethicon’s]
underlying summary judgment briefing.” (Pl. Reply Br. at 2.) In response, Ethicon cites the
well-established principle that “matters raised below as alternative grounds in support of a
6It does not appear that Ethicon raised this argument in any of its evidentiary motions before the district
court.

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judgment are properly before this Court even in the absence of a cross-appeal.” (Def. Br. at 20
n.1 (quoting United States v. True, 250 F.3d 410, 419 (6th Cir. 2001)).) According to Ethicon,
“it is appropriate for this Court to address the admissibility of these [expert] opinions as part of
its de novo review.” (Id.) That is incorrect.
While courts may refuse to consider certain types of inadmissible evidence when ruling
on a motion for summary judgment, see Alexander v. CareSource, 576 F.3d 551, 558–59 (6th
Cir. 2009), Ethicon never asked the district court to disregard Dr. Rosenzweig’s opinions for the
purpose of summary judgment. In fact, Ethicon’s motion for summary judgment relied on the
expert reports that it now asks this Court to disregard. Therefore, Ethicon’s evidentiary
arguments are not “alternative grounds” for summary judgment at all. See True, 250 F.3d at 419.
Rather, Ethicon is trying to transplant arguments from its evidentiary motions that the district
court never considered. Even if some of these arguments may have merit, they are not within the
scope of this appeal. We therefore take the same approach as the district court and assume that
the expert testimony is admissible for the purpose of summary judgment. Ethicon did not
advocate for any other approach in its motion for summary judgment, and we decline to permit
Ethicon to change its litigation strategy on appeal. Assuming all the evidence attached to the
summary judgment briefs is admissible, Thacker has raised genuine disputes of material fact
concerning the feasibility of Ultrapro as an alternative design to the Prolene mesh used in both
the Prolift and the TVT-Secur.
2. Negligence and Gross Negligence Claims
Thacker brought similar product liability claims under negligence and gross negligence
theories. Under Kentucky law, plaintiffs may bring design defect and failure to warn claims
under either a strict liability or a negligence theory. Ostendorf v. Clark Equipment Co., 122
S.W.3d 530, 535 (Ky. 2003) (citing Williams v. Fulmer, 695 S.W.2d 411 (1985)). “In defective
design cases, ‘the distinction between the so-called strict liability principle and negligence is of
no practical significance.’” Sexton, 926 F.2d at 336 (quoting Jones, 502 S.W.2d at 69–70). And
in negligent failure to warn cases, the elements overlap with a strict liability claim because the
plaintiff must establish that the inadequate warning proximately caused her injuries. See
Holbrook v. Rose, 458 S.W.2d 155, 157 (Ky. 1970).

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Ethicon’s only argument against these claims in its motion for summary judgment was
that Thacker “cannot prove the strict liability counterparts of any of her products liability claims,
and her negligence and gross negligence claims fail for the same reasons.” (Mot. Summ. J., R.
159, Page ID #2778; Def. Br. at 36–37.) That is, Ethicon argues that Thacker’s negligence
claims fail because she did not produce evidence of a feasible alternative design (for negligent
design defect) or proximate causation (for negligent failure to warn). In granting summary
judgment, the district court agreed and found that “[b]ecause a negligence theory under the two
claims [of design defect and failure to warn] requires the same” showings of alternative feasible
design and proximate causation, “the negligence claim[s] must fail as well.” Thacker, 571 F.
Supp. 3d at 707. Because Thacker has raised genuine disputes of fact on these elements for her
strict liability claims, she has raised the same disputes for her negligence claims. Therefore, the
district court erred in granting summary judgment on these claims.7
III. CONCLUSION
For these reasons, we REVERSE the district court’s order granting Ethicon’s motion for
summary judgment and REMAND for further proceedings.
7Thacker’s complaint also stated claims for punitive damages and “discovery rule/tolling.” (Opp’n Mot.
Summ. J., R. 225, Page ID #10348.) Thacker relinquished any tolling argument in her opposition to summary
judgment, admitting that this argument was moot because Ethicon never asserted a statute of limitations defense.
However, she maintains that she should be able to seek punitive damages. She argues that her request for punitive
damages was consistent with “pleading doctrines,” and it was “not [a] cause[] of action.” (Pl. Br. at 33.) Thus, she
contends that the district court could not dismiss her request for punitive damages. The district court agreed to some
extent and held that “there is no claim to grant or deny summary judgment upon.” Thacker, 571 F. Supp. 3d at 708.
However, the district court did conclude that “since [it] granted summary judgment on all claims for the defendants,
there can be no punitive damages.” Id. Under Kentucky law, Thacker may be able to seek punitive damages if she
prevails at trial. See generally Jones v. IC Bus, LLC, 626 S.W.3d 661, 682 (Ky. Ct. App. 2020).

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