The Zimmer knee replacement lawsuit was a multidistrict litigation against Zimmer (now Zimmer Biomet) over its NexGen knee implant system, alleging the devices were defectively designed and failed prematurely. At its peak the MDL included more than 1,700 federal cases. It ended in a confidential 2018 settlement that resolved nearly all remaining claims, and the MDL was formally closed in November 2022.1Drugwatch. Knee Replacement Lawsuits No federal knee replacement MDL is currently active.
What Patients Said Was Wrong With the NexGen Knee
The components that drew the most legal scrutiny were the “high-flex” femoral pieces (LPS-Flex, CR-Flex, and their Gender Solutions Female variants) and the MIS (Minimally Invasive Solutions) Stemmed Tibial Components. Nearly 1.5 million NexGen knee replacements were implanted starting in 1994.2Strom Law Firm. Zimmer NexGen
The high-flex components were marketed as allowing up to 155 degrees of knee flexion, far more than standard implants. Plaintiffs alleged that promised benefit never materialized and that the design produced significantly higher failure rates than conventional knee replacements. The master complaint stated that “the purported benefit of added flexion simply does not exist” and that the devices were failing prematurely, forcing patients into expensive and risky revision surgeries.3ClassAction.org. In Re Zimmer NexGen Knee Implant Master Complaint
A 2010 study by Drs. Berger and Della Valle of Rush University Medical Center looked at 108 patients who received the NexGen CR-Flex Porous Femoral Component. It found 36% showed radiographic loosening and 8.3% required revision surgery for femoral loosening and pain. The researchers wrote that “loosening and revision were not related to surgeon, approach or patient type,” pointing to the device itself rather than surgical technique.4U.S. Securities and Exchange Commission. Zimmer NexGen CR-Flex Study Reference
The MIS Tibial Components raised a different concern. Their low profile and broad proximal fins were designed for minimally invasive procedures, but the smaller surgical opening restricted the surgeon’s view, which plaintiffs said led to implant misalignment and faulty anchoring.3ClassAction.org. In Re Zimmer NexGen Knee Implant Master Complaint
FDA Recalls of NexGen Components
Several NexGen components have been recalled, including recently:
- September 2010, MIS Stemmed Tibial Components. More than 68,000 units recalled after reports of high failure rates, with 114 documented cases of complications requiring revision surgery.3ClassAction.org. In Re Zimmer NexGen Knee Implant Master Complaint
- September 2010, LPS Femoral Component. A Class 2 recall (Z-0534-2011) covering 158 units due to a nonconforming internal CAM radius caused by a process design flaw.5U.S. Food and Drug Administration. Recall Z-0534-2011 NexGen LPS Femoral Component
- December 2022, NexGen Stemmed Option Tibial Components. A Class 2 recall (Z-0466-2023) covering 1,673 units, triggered by UK National Joint Registry data showing significantly higher revision rates when these tibial components were paired with LPS-Flex or LPS-Flex Gender Solutions femoral components.6U.S. Food and Drug Administration. Recall Z-0466-2023 NexGen Stemmed Tibial Component
- March 2024, CR-Flex Femoral Component. A Class 2 recall (Z-1608-2024) affecting 5,546 units distributed worldwide, over an out-of-specification manufacturing gap that prevented the fiber metal pad from fully bonding to the substrate.7U.S. Food and Drug Administration. Recall Z-1608-2024 NexGen CR-Flex Femoral Component
The UK data behind the 2022 recall was striking. The National Joint Registry found that the NexGen Stemmed Tibial Component, when used with LPS-Flex femoral parts, carried roughly double the overall revision rate of an average total knee replacement. The risk of revision specifically for aseptic tibial loosening (where the implant separates from the bone without infection) was more than five times higher than the benchmark.8UK Government. NexGen Knee Replacement Affected Patients Should Be Offered Additional Follow-Up Zimmer Biomet’s own field safety notice acknowledged the elevated risk while noting that the cumulative revision rate for all reasons remained below 10% at ten years.9Zimmer Biomet. Risk Manager and Surgeon Letter ZFA 2022-00240
How the MDL Was Resolved
On August 8, 2011, the Judicial Panel on Multidistrict Litigation consolidated the first NexGen suits in the U.S. District Court for the Northern District of Illinois, before Judge Rebecca R. Pallmeyer. The case became MDL No. 2272 and eventually grew to more than 1,700 lawsuits focused on the high-flex femoral components and the MIS Tibial Component.10Bloomberg Law. Panel Consolidates Zimmer NexGen Suits, Sends Matter to Northern District of Illinois
Judge Pallmeyer used bellwether trials to test the plaintiffs’ claims, and Zimmer won all three that reached a decision. The first, in October 2015, produced a defense verdict. In the second, Joas v. Zimmer (October 2016), the court granted summary judgment for Zimmer, ruling that plaintiffs “lacked a reliable scientific basis for their claims.”11Faegre Drinker. Zimmer Biomet Team Wins Second Bellwether Trial Defending NexGen Flex Knee Implants A third bellwether in January 2017 again went to Zimmer, and a planned fourth was dismissed that March.12ConsumerNotice.org. Knee Replacement Lawsuits
By August 2017, nearly 1,400 of the 1,700-plus cases had already been dismissed or withdrawn. In January 2018, Judge Pallmeyer ordered the remaining parties into arbitration.13ConsumerSafety.org. Knee Replacement Lawsuits On February 12, 2018, the parties told the court they had reached a settlement in principle covering all state and federal cases pending as of January 14, 2018. By June 2018, counsel confirmed a “final confidential settlement.” According to Zimmer Biomet’s 2018 annual report, the agreement resolved all but six of the outstanding MDL cases.14Law360. In Re Zimmer NexGen Knee Implant Products Liability Litigation A further agreement in February 2019 settled 273 of the 279 cases still pending at that stage.12ConsumerNotice.org. Knee Replacement Lawsuits
The dollar terms of the settlement have never been disclosed, and the MDL was officially closed in November 2022.1Drugwatch. Knee Replacement Lawsuits
Can You Still Sue Over a Zimmer Knee?
The NexGen MDL is closed, and as of March 2026 no active knee replacement MDL exists in federal courts.1Drugwatch. Knee Replacement Lawsuits That does not mean every Zimmer knee issue has been litigated. The company’s newer Persona knee system has produced its own recalls and individual lawsuits that were never consolidated.
In March 2015, the FDA issued a Class 2 recall of 11,658 Persona Trabecular Metal Tibial Plate implants after reports of loosening and radiolucent lines on X-rays indicating gaps between the implant and the bone. The recall covered all sizes and lots of the device, which had been on the market for about three years, and followed what the company described as a 61% complaint rate for procedures using the implant.15TenLaw. Zimmer Persona Knee Implant Recalled By June 2017, the FDA had recorded 183 complaints and 64 revision surgeries tied to the Persona knee.12ConsumerNotice.org. Knee Replacement Lawsuits Reports in the FDA’s MAUDE database describe patients who underwent multiple revisions after receiving Persona implants, with problems including implant loosening, flexion instability, and chronic pain requiring additional surgical procedures.16U.S. Food and Drug Administration. MAUDE Report MW5147713 Persona Knee System
Whether an individual claim is still viable depends on the specific device, the date of implantation, the date of injury or revision, and the statute of limitations in your state. If you received a NexGen or Persona implant and have had problems such as loosening, instability, pain, or revision surgery, a product liability attorney can tell you whether a claim is still possible in your situation.