DePuy Attune Knee Lawsuit: The Loosening and Failure Claims

What the Lawsuits Allege

The DePuy Attune, a Johnson & Johnson knee-replacement system, became widely used after its introduction — an estimated 400,000 implanted worldwide. Lawsuits allege a design defect causes the tibial baseplate (the part anchored to the shin bone) to loosen prematurely, because the component debonds at the baseplate-cement interface. Plaintiffs point to the baseplate’s very smooth surface — reportedly far smoother than prior designs — as preventing the cement from gripping properly, leading to pain, instability and early revision surgery.

The claim is a design-and-warning theory: that the implant fails sooner than a knee replacement should and that the risk was not adequately disclosed.

The Status

Regulators received hundreds of reports of Attune problems, including many involving revision surgery. Notably, the Attune has never been recalled, which shapes the litigation: without a recall, plaintiffs must build the defect case largely through their own evidence and experts. Cases have been filed individually rather than resolved through a single global settlement.

The absence of a recall does not defeat a product-liability claim, but it removes a piece of evidence plaintiffs in recalled-device cases can lean on.

What Patients Should Know

Anyone whose Attune knee loosened and required revision should keep the operative reports and any imaging showing the loosening, which are the core evidence. This is legal-news coverage, not medical advice; a persistent painful or unstable knee replacement warrants prompt evaluation regardless of any claim.