If a defective knee implant injured you, a knee replacement lawsuit against the manufacturer is generally available, and most of these cases proceed as product liability claims rather than malpractice suits against the surgeon. Whether yours is viable turns on which device you received, how it failed, whether you’re still within your state’s filing deadlines, and whether the physical evidence has been preserved. Roughly 800,000 knee replacements are performed in the United States each year, and even a small defect rate across that volume has produced thousands of active claims and several consolidated federal proceedings.
Do You Have a Case
Not every painful outcome after knee surgery is a lawsuit. Infection, surgical technique, and problems during rehabilitation cause failures that have nothing to do with the implant. A product liability claim requires showing that the device itself was defective when it left the manufacturer’s control and that the defect directly caused your injury.1Legal Information Institute. Products Liability
Three kinds of defect drive these cases. A design defect means the implant was unsafe as conceived, regardless of how carefully it was built. A manufacturing defect means the design was sound but the specific unit implanted in you deviated from that design during production. A failure-to-warn claim means the manufacturer knew about risks and didn’t communicate them adequately. All three can appear in the same case.1Legal Information Institute. Products Liability
Certain failure patterns recur because they trace directly to the device rather than to the surgery:
- Early loosening. The bond between implant and bone breaks down and the component shifts, causing instability, grinding, and worsening pain. A properly functioning implant should hold fixation for well over a decade, so loosening within the first few years is a red flag.
- Metal debris and metallosis. Metal-on-metal bearing surfaces shed microscopic particles that accumulate in tissue, triggering inflammation, tissue death, and sometimes systemic symptoms when metal ions enter the bloodstream.
- Implant fracture. A component cracks or breaks under load and the joint fails catastrophically. These claims turn on material selection and often involve a metallurgical engineer examining the broken piece for porosity, inclusions, or improper heat treatment.
- Misalignment-related wear. An implant seated a few degrees off wears unevenly and fails early. Where the device’s geometry or the manufacturer’s cutting guides pushed the surgeon toward imprecise placement, the manufacturer shares responsibility.
One legal hurdle sits over every failure-to-warn theory. Under the learned intermediary doctrine, applied in most states, a device manufacturer generally satisfies its duty to warn by informing the surgeon rather than the patient directly. Overcoming that defense requires showing the warnings to the surgeon were themselves inadequate, or that the company marketed the device to consumers in a way that bypassed the surgeon.
Which Knee Implants Are Being Sued
Identifying your specific device is one of the most useful things you can do early. Several product lines are the subject of active litigation.
Exactech Polyethylene Inserts
In February 2022, Exactech expanded an earlier recall to cover all knee and ankle polyethylene inserts packaged in non-conforming vacuum bags. Oxygen penetrated the plastic liner during storage, oxidizing the material and causing inserts to wear out far sooner than expected. The FDA classified the action as a Class II recall covering the OPTETRAK, OPTETRAK Logic, TRULIANT, and VANTAGE product lines, among others.2U.S. Food and Drug Administration. Medical Device Recalls – Exactech Polyethylene Orthopedic Products The federal cases are consolidated as MDL No. 3044 in the Eastern District of New York before Judge Nicholas G. Garaufis.3Judicial Panel on Multidistrict Litigation. MDL No. 3044 Transfer Order – In Re Exactech Polyethylene Orthopedic Products Liability Litigation
Zimmer Biomet NexGen
Zimmer Biomet voluntarily recalled its NexGen Stemmed Option Tibial Components when used with certain femoral components. The FDA classified the action as a Class II recall after data from the United Kingdom’s National Joint Registry showed those combinations had significantly higher revision rates than other total knee replacements, particularly for loosening of the tibial component.4U.S. Food and Drug Administration. Class 2 Device Recall NexGen Option Stemmed Tibial Component
DePuy Synthes Attune
Lawsuits over the DePuy Attune Knee System allege that the tibial baseplate’s smooth surface prevents proper bonding with bone cement, causing early loosening. The FDA has issued at least one Class II recall involving Attune labeling.5U.S. Food and Drug Administration. Class 2 Device Recall ATTUNE Knee System Tibial Base The lawsuits go beyond labeling and target the design itself. If you have an Attune and are experiencing pain or instability within a few years of surgery, that timeline matches the pattern alleged in the litigation.
When many patients across the country sue the same manufacturer, a federal panel can consolidate the cases into a multidistrict litigation for coordinated pretrial work.6Office of the Law Revision Counsel. 28 U.S. Code 1407 – Multidistrict Litigation An MDL is not a class action. Your case remains individual, and your own age, injury, and medical history still determine what your claim is worth. What consolidation gives you is access to the discovery and expert work the plaintiffs’ group has already developed, which would cost an individual plaintiff a fortune to build from scratch.
How the FDA Pathway Affects Your Right to Sue
Manufacturers routinely argue that FDA involvement bars state-law claims. Whether that argument works depends entirely on how the device was cleared.
Most knee implants reach the market through the FDA’s 510(k) process, which asks whether a new device is “substantially equivalent” to one already sold. That is a comparative review, not an independent safety determination. Premarket approval (PMA) is the more rigorous pathway, requiring the manufacturer to prove safety and effectiveness through clinical data.7U.S. Food and Drug Administration. Medical Device Safety and the 510(k) Clearance Process
In Riegel v. Medtronic (2008), the Supreme Court held that state-law tort claims against PMA-approved devices are preempted by federal law. The Court drew a sharp line between PMA and 510(k), noting that 510(k) devices have “never been formally reviewed under the MDA for safety or efficacy.”8Justia. Riegel v. Medtronic, Inc., 552 U.S. 312 Because most knee implants are 510(k)-cleared, most knee replacement lawsuits are not blocked by preemption. Even for PMA devices, a narrow “parallel claim” survives if the plaintiff can identify a specific federal requirement the manufacturer violated and tie that violation to the injury.
Deadlines That Can End Your Claim
Two separate deadlines apply to knee implant lawsuits, and they work differently. Missing either one is the fastest way to lose a valid claim.
Statute of Limitations
Most states allow two to four years to file a personal injury claim tied to a medical device. The question is when the clock starts. Some states run it from the date of surgery. Others apply the discovery rule and start it when you knew or reasonably should have known the injury was connected to the device.9Justia. Statutes of Limitations and the Discovery Rule in Medical Malpractice Lawsuits Imaging that first showed loosening, or the visit where a doctor told you the implant was failing, often anchors the discovery date.
Statute of Repose
A statute of repose is the harder deadline. It runs from a fixed event, usually the date the device was sold or implanted, and the discovery rule does not pause it.10Legal Information Institute. Statute of Repose A patient can theoretically be barred from suing before knowing the implant failed. Not every state has one for product liability, and the length varies where it exists, but this is the deadline that catches people off guard. If your implant is old and problems are only starting now, that specific situation calls for a quick consultation.
What a Knee Implant Case Can Be Worth
Settlement value varies widely because it tracks how badly the failed implant disrupted your life and how cleanly the evidence connects that disruption to the device.
Economic Damages
These are your quantifiable losses: hospital bills, revision surgery, physical therapy, medications, lost wages, and any reduction in future earning capacity. Save every bill and every record of missed work. Future medical costs are recoverable when your doctors can support the projection.11Justia. Damages in Medical Malpractice Lawsuits
Non-Economic Damages
Pain, restricted mobility, emotional distress, and the loss of activities you used to do fall here. These are harder to quantify but often make up the largest part of a verdict. Severity and permanence carry the most weight. Some states cap non-economic damages in medical liability cases, which can materially reduce recovery.11Justia. Damages in Medical Malpractice Lawsuits
Punitive Damages
Courts award punitive damages when a manufacturer did worse than make an honest engineering mistake. Suppressing unfavorable data, ignoring internal warnings, or continuing to sell a device known to be defective can open the door. The proof usually comes from internal emails, engineering memos, and regulatory submissions that contradict the company’s public statements.11Justia. Damages in Medical Malpractice Lawsuits
What Actually Moves the Number
- Severity and permanence. One successful revision that restored function is worth less than multiple revisions, chronic pain, or permanent disability. Permanence is the single most influential factor.
- Age. Younger plaintiffs generally recover more because they have more years of diminished quality of life ahead, and defense arguments about age-related degeneration land less easily.
- Medical history. Pre-existing knee problems, obesity, and osteoporosis give the defense room to argue the device wasn’t fully at fault.
- Your surgeon’s testimony. The surgeon who performed your revision, describing what they found when they removed the implant, carries more weight than a hired expert.
- Physical evidence of the defect. Cases backed by FDA recalls, internal company documents, or metallurgical analysis of the explanted device settle for more than cases resting on symptoms alone.
Medicare and Insurance Liens
A detail that surprises many plaintiffs: if Medicare paid for your original surgery, your revision, or related care, the federal government has a right to be reimbursed from your settlement. Under the Medicare Secondary Payer Act, conditional payments must be repaid, and interest accrues if reimbursement isn’t made within 60 days of notice that a primary plan is responsible.12Office of the Law Revision Counsel. 42 U.S. Code 1395y – Exclusions From Coverage and Medicare as Secondary Payer Private insurers often assert similar subrogation rights. These liens need to be identified and negotiated before any settlement is finalized, or you can end up personally liable for the repayment out of your own recovery.
What to Do Now if Your Implant Is Failing
Preserve the device. If revision surgery is coming, tell your surgeon in writing that you want the explanted components saved. Hospitals routinely discard removed implants as medical waste. The failed device is the single most important piece of physical evidence. A metallurgical engineer can examine it for manufacturing defects, abnormal wear, and material failures that are close to impossible to prove without the actual hardware.
Pull your records. Request complete operative reports from the original surgery and any revisions, along with all imaging. Identify the exact model and lot number from the surgical records or from the implant identification card you should have received after surgery. Check the FDA’s recall database for your specific device.
Talk to a device litigation attorney. These cases are expensive to litigate because they require both engineering and medical experts and extensive discovery. Most device attorneys work on contingency, typically 33% to 40%, though some states cap attorney fees in medical liability cases. You generally pay nothing upfront.
Don’t sit on it. Limitations and repose deadlines are unforgiving, and repose in particular can bar a claim before you even know you have one. A consultation costs nothing and can tell you whether you have a viable case before any deadline runs.