The monoblock TMZF stem failures looked exactly like the Rejuvenate and ABG II failures. Patients suffered from high levels of cobalt and chromium in their blood, the development of large fluid collections and pseudotumors and frequently pain, disability, bone and tissue destruction. Upon deeper investigation it became clear that corrosion, fretting and the release of metal wear debris was occurring at the connection between the stems and metal femoral heads. This was exactly the same failure mode as the dual modular Rejuvenate and ABG II just at a different metal on metal connection. The problem is frequently referred to as “metallosis.”
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