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Knee Replacement Lawsuits

People who have filed knee replacement lawsuits claim the devices loosened, became unstable and they required surgery to correct their problems. One knee implant manufacturer paid $1 billion to settle 4,000 lawsuits filed over its faulty devices.

Knee Replacement Legal Stats
  1. Number of Lawsuits High of 1,800 cases MDL (Zimmer)
  2. Plaintiff Injuries Pain, further knee damage, infection, need for revision surgery
  3. Defendants Zimmer; Stryker; Smith & Nephew; DePuy
  4. Bellwether Trial Date Nov. 5, 2015 (first Zimmer bellwether)
  5. MDL Status Active (Zimmer)
  6. Top Settlement OtisMed (Stryker) paid $80 million to resolve criminal and civil investigations

Knee replacements are among the most common joint replacement surgeries in the U.S. With more than 600,000 knee replacement surgeries every year, even a small number of failures can affect hundreds of people. One study predicts nearly 3.5 million knee replacements will be performed every year by 2030.

Repairing complications from a defective knee implant can require surgery to repair or replace the device. This can be a costly proposition for patients who suffer knee replacement complications, running up medical bills while frequently losing income while they recover.

Thousands of people who suffered serious knee replacement complications have filed lawsuits since 2000. Newly discovered issues with newer knee replacements may result in hundreds more lawsuits in the future.

Current Status of Knee Replacement Lawsuits

There currently is only one large, multidistrict litigation (MDL) involving knee replacements. The Zimmer NexGen Knee MDL once involved nearly 1,800 individual lawsuits, but most have been dismissed and the judge in the case has told parties on all sides to negotiate an agreement to resolve the remaining cases.


Knee Replacement Areas

MDLs combine several similar lawsuits with similar facts and injuries. They allow cases to move more quickly through the legal process while keeping legal costs down.

In 2015, Zimmer issued a recall for all 11,000 of its Persona Knee implants in distribution at the time. Attorneys are still talking with people affected by defects with these devices about the potential for Persona Knee lawsuits. In addition, some people have pressed ahead with individual lawsuits over various knee implant models including the Persona Knee.

In 2017, more than two dozen people sued German implant maker B. Braun in Los Angeles Superior court. They claim their ceramic knee implants loosened when the cement used to attach the devices to their bones failed.

Why People Sue Over Knee Implant Failures

People who have experienced loosening or instability that requires surgery to fix their knee implants may be able to sue the device’s manufacturer.

Why people have sued over the Zimmer Persona Knee Implant:
More than 11,000 Persona Knee implants were recalled over defective screws that failed, allowing the device to loosen
Revision surgery
Repairing or replacing defective parts requires a second surgery, involving added surgical risks, hospital bills and lost wages during recovery

Filing a lawsuit can be a complicated process. There are several things to consider before filing a claim for knee replacement implant injuries.

Things to Consider Before Filing a Knee Replacement Lawsuit:
The law limits the amount of time a person has to file a claim
Each state has different statutes of limitation, so it’s important to talk to an attorney about when and where the injury occurred.
Participating in a recall could affect possible compensation from a lawsuit
If people are injured by an implant that is later recalled, they could limit their ability to file lawsuits if they participate in the recall. It’s best to talk to a qualified attorney — not a device manufacturer’s representative or a doctor — about how to protect legal claims during a recall.
It’s a good idea to consult a qualified device attorney
Knee replacement injuries have already resulted in thousands of lawsuits. Qualified device attorneys are familiar with device manufacturers’ legal strategies and issues that are common in these types of claims. They can offer information on where to file a claim, whether it’s in a person’s best interest to join any potential class action, and how to obtain a possible legal settlement. Every situation is different, and a qualified device attorney can help explain all the legal options.
Free consultations are available
Most device attorneys offer free consultations to help determine if a person has a legal claim. But be sure to ask about fees before hiring any lawyer. Usually, these attorneys work on a contingency basis, meaning they do not get paid unless they win the case or obtain a settlement.

Knee Replacement Lawsuits Can Take Years

A lone Pennsylvania lawsuit over Zimmer’s Gender Solutions Knee spent more than 9 years working its way through the legal system.

Margo Polett received the knee in 2006. Several months later, she agreed to appear in a marketing video for Zimmer’s knee replacement devices. The video involved Polett walking on a treadmill and riding a stationary bike. During the taping, she developed problems that led to persistent pain and required multiple surgeries.

She filed a lawsuit in 2008 beginning a long series of appeals that continued through 2017.

Zimmer Gender Solutions Knee Lawsuit Timeline
  • 2008
    Margo Polett filed lawsuit against Zimmer
  • November 2010
    Jury awarded Polett $27.6 million
  • September 2011
    Judge upheld $27.6 million verdict
  • May 2013
    Pennsylvania Superior Court reversed the verdict
  • October 2015
    Pennsylvania Supreme Court reinstated the $27.6 million verdict and sent the case back to Superior Court
  • June 2016
    Superior Court determined the $27.6 million verdict was excessive and ordered the lower court to reassess damages, which resulted in a reduction to about $20 million
  • December 2017
    Pennsylvania appeals court upheld the $20 million, rejecting Zimmer’s calls to reduce it further, to around $5 million

Even after the December 2017 decision, Zimmer still had the option of appealing to the state Supreme Court.

Accusations Against Manufacturers

Knee replacement lawsuits usually claim the product was defective and that the manufacturer knew or should have known about the risks, but failed to warn patients.

Typical knee replacement lawsuit claims against manufacturers include:
  • The manufacturer marketed the knee implant as safe and effective when it was not
  • The device’s defects were related to the design, manufacture or marketing of the implant
  • The manufacturer knew or should have known about the defects
  • The manufacturer failed to warn patients of the defect and its potential consequences

Knee Implant Brands and Manufacturers Named in Lawsuits

Knee replacement lawsuits often follow manufacturer major recalls of particular models of knee implants. Recalls will frequently highlight a problem with the design, manufacturing process, or packaging and marketing that resulted in several people experiencing the same problem with a knee implant.

Manufacturers and Models Currently Involved in Knee Replacement Lawsuits Include:
Manufacturer Model Name Why People Are Suing
Zimmer NexGen

Persona Knee
Premature loosening

Loosening due to defective screws
Arthrex iBalance Knee Pain and instability
DePuy Attune Knee System Instability and loosening
Exactech Optetrack Knee Excessive wear leading to premature failure
B. Braun (Aesculap Implant Systems) Advanced Surface ceramic coated knees Device failure after cement fails to adhere to bone

Previous Knee Replacement Verdicts and Settlements

In one of the largest knee implant settlements, Sulzer Medica agreed to pay $1 billion to settle roughly 4,000 lawsuits over its hip and knee implants in 2002. Zimmer purchased Sulzer (by then renamed Centerpulse) for more than $3 billion in 2003.

Settlement Amounts in the Sulzer Medica Case Averaged $200,000 per Patient.

More recent knee implant lawsuits have not been as successful. More than 1,740 lawsuits over Zimmer’s NexGen knee were once part of the current multidistrict litigation. Bellwether trials, test cases drawn from those hundreds of lawsuits to gauge how juries will weigh the facts, went to court starting in 2015. Zimmer was able to win the early test cases.

Zimmer NexGen Knee Lawsuit Timeline
  • August 2011
    Lawsuits over NexGen Knee Implants combined into an MDL
  • November 2015
    First bellwether trial ends in win for Zimmer
  • October 2016
    Judge issues order requiring plaintiffs to present more evidence in lawsuits, resulting in win for Zimmer in second bellwether trial
  • January 2017
    Illinois federal jury rules in favor of Zimmer after one day of deliberations in third bellwether trial
  • January – August 2017
    More than 1,400 cases are dismissed or withdrawn from the MDL
  • August 2017
    MDL judge presses both sides to engage in settlement talks or mediation to resolve their cases

As of November 2017, no settlement had been reached in the NexGen Knee MDL and only 329 of the lawsuits were still pending.

The trio of victories for Zimmer, along with the higher standard of evidence plaintiffs had to present, led hundreds of people to withdraw their lawsuits.

Pennsylvania Superior Court
The Pennsylvania appeals court reversed a $20 million verdict award against Zimmer and Public Communications Inc.

Class Action Lawsuits and Knee Replacements

There are currently no class action lawsuits involving defective knee replacements. Class actions are not always well suited for medical device lawsuits. Usually, people will file individual lawsuits against a manufacturer over a particular device such as a knee implant. If several people sue the same company for the same defect and injuries their cases will sometimes be combined in a single court.

Manufacturer Recalls and Studies Highlight Knee Replacement Failures

Manufacturer recalls of large numbers of knee implants and clinical studies of implant failures underline the potential for injuries from defective knee replacement devices.

Artificial joints are generally expected to last at least 15 years, but some fail much sooner:
  • A 2010 study from the American Academy of Orthopaedic Surgeons found Zimmer knee implants failed at a rate of 36 percent and more than a third of all cases required a follow-up procedure known as revision surgery.
  • A separate study forced Johnson & Johnson subsidiary DePuy to acknowledge a 49 percent failure rate within six years. The company previously reported only a 13 percent failure rate.

Zimmer’s recalls of the NexGen and Persona Knee implants have involved more than 50,000 devices.

Zimmer NexGen Knee Lawsuit Timeline
  • 2014
    Zimmer recalls 40,000 NexGen knee implants due to reports of defective screws that could cause loosening.
  • February 2015
    Zimmer recalls 11,658 Persona Trabecular Metal Tibial Plate knee implants for early loosening.

Before those high profile recalls, knee implant manufacturers issued more than 700 recalls for their devices during a recent 10 year period. Consumers Union researched recall notices companies sent to the U.S. Food and Drug Administration (FDA) between 2003 and 2013.

Knee Implant Manufacturer Number of Recalls
DePuy 277
Zimmer 224
Stryker 118
Biomet 75
Smith & Nephew 11
Wright Medical 4
Knee Implant Manufacturer Pie Chart

Knee Implant Manufacturers recalls compared to the total amount of recalls

Knee implant manufacturers are legally responsible for marketing their products properly and adequately warning consumers and health care professionals about their risks. Ideally, device makers properly design and test their products before they reach consumers. They are also responsible for monitoring their products for problems after they’ve received approval.

But critics argue that the U.S. Food and Drug Administration (FDA) approval process doesn’t do enough to keep unsafe devices off the market. The agency’s Premarket Notification, or 510(k) process, determines if a proposed knee implant is equivalent to a device already on the market. If so, the new implant doesn’t have to be so thoroughly tested before approval.

Please seek the advice of a medical professional before making health care decisions.

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20 Cited Research Articles

  1. Lexis Legal News. (2015, November 11). 1st NexGen Knee Bellwether Trial Ends In Defense Verdict For Defendant Zimmer Inc. Retrieved from
  2. Corso, J. (2017, March 16). Another Bellwether Drops out of Zimmer Knee Implant MDL. Retrieved from
  3. Jones, D. (2017, January 26). Zimmer Gets Win In 3rd Knee Implant Bellwether. Retrieved from
  4. Fair, M. (2016, June 6). Zimmer Gets $20M Knee Injury Verdict Trashed in Pa. Retrieved from
  5. Bodine, L. (2017, January 6). Judge Admits Causation Expert in Zimmer knee Replacement MDL. Retrieved from
  6. United States District Court Northern District of Illinois. MDL 2272 In Re Zimmer Nexgen Knee Implant Products Liability Litigation. Retrieved from
  7. U.S. Food & Drug Administration. (2015, June 26) OtisMed Corporation former CEO sentenced for shipping adulterated knee replacement cutting guides. Retrieved from
  8. Meier, B. (2010, June 19). Surgeon vs. Knee Maker: Who’s Rejecting Whom? The New York Times. Retrieved from
  9. In Re Zimmer NexGen Knee Implant Products Liability Litigation, MDL No. 2272, Transfer Order (J.P.M.L. Aug. 8, 2011). Retrieved from
  10. Meier, B. (2011, December 22). New Models of Implants Not Better, Study Finds. The New York Times. Retrieved from
  11. U.S. Judicial Panel on Multidistrict Litigation. (2012 September). MDL Statistics Report - Distribution of Pending MDL Dockets. Retrieved from
  12. Duroni, L. (2015, April 14). Smikth & Nephew Sued Over Failed Knee Replacement. Retrieved
  13. U.S. District Court, Western District of Louisiana (Lafayette). (2012) Civil Docket for Case # 6:12-cv-00761-RFD-PJH. Henry Bias V. Smith & Nephew.
  14. U.S. District Court for the District of Hawaii. (2104, July 1). Manuel A. Sanchez V. Johnson & Johnson Service Inc., Johnson & Johnson Incorporated, Johnson & Johnson Consumer Companies Inc.; DePuy Orthopedics, Inc., and Doe Defendants 1-100. Complaint.
  15. U.S. District Court for the District of Hawaii. (2105, November 9). Manuel A. Sanchez V. Johnson & Johnson Service Inc., Johnson & Johnson Incorporated, Johnson & Johnson Consumer Companies Inc.; DePuy Orthopedics, Inc., and Doe Defendants 1-100. Stipulation For Dismissal with Prejudice of All Claims and Parties.
  16. United States District Court Northern District of Illinois. MDL 2272 In Re Zimmer Nexgen Knee Implant Products Liability Litigation. (2017, May 8). Case Number 1:11-cv-05468. Memorandum of Law in Support of Motion for Suggestion of Remand.
  17. United States District Court Northern District of Illinois. MDL 2272 In Re Zimmer Nexgen Knee Implant Products Liability Litigation. (2017, May 23). Case Number 1:11-cv-05468. Notification of Docket Entry. Minutes.
  18. Dye, J. (2015, November 6). Zimmer wins first U.S. trial over NexGen Flex knee devices. Retrieved
  19. Jones, D. N. (2017, January 26). Zimmer Gets Win in 3rd Knee Implant Bellwether. Retrieved
  20. Trader, St. (2016, October 24). Zimmer Gets Quick Win In 2nd Knee Implant Defect Bellwether. Retrieved
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