Cobalt Chromium Toxicity

stryker accolade tmzf

Stryker Accolade TMZF: Metal on Metal Hip Implant Corrosion

Stryker Corp., a subsidiary of Howmedica Osteonics Corporation, faces lawsuits regarding the company’s recalled Accolade TMZF hip stem and LFIT anatomic  V40 femoral head. The lawsuits claim Stryker Corp. failed to warn the device may corrode, causing severe metal toxicity (metallosis) in patients. Stryker Corp. is also the manufacturer of the defective Rejuvenate and ABG II modular-neck stems, which were recalled in July 2012. The Accolade TMZF was later recalled in October 2012. According to the FDA, the manufacturer’s reason for the recall was due to grit blast media, which was observed in the drive hole. Grit blast media, a term referring to any fine powder used as an abrasive, was found as the wearing debris due to the compromised wearing resistance of the titanium alloy (Chen and Thouas 121)* in the hip stem.

The Stryker Accolade is associated with the release of cobalt and chromium metals into the bloodstream. The femoral head of the Accolade hip implant is made with a cobalt and chromium alloy, whereas the hip stem is made with titanium alloy. The combination of the femoral head and hip stem causes significant corrosion and fretting, resulting in metallosis and subsequently permanent damage to tissues and bone, as well as pseudotumors. The Stryker Accolade TMZF, like the Stryker Rejuvenate and ABG II implants, was designed and manufactured without structures that prevent fretting and corrosion. Additionally, Stryker discontinued using TMZF titanium concurrent to the Rejuvenate and ABG II recalls.

Our attorneys have extensive experience, and proven results, litigating defective hip cases. Contact an attorney for a free case consultation if you have a Stryker Accolade TMZF. We focus on your case, so you can focus on yourself.

*Biomaterials: A Basic Introduction, by Qizhi Chen and George Thouas

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