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Evaluation of Prosthetic Implant Degradation

Orthopedic Prostheses


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Issues of Concern

Slide 5

December 2011

Metal implants wear due to continuous motion at the metal-on-metal surface resulting in release of micro-particles into the surrounding tissues. These micro-particles can corrode, resulting in release of metal ions into the systemic circulation. Hip implants are made from several different alloys. The acetabular cup and femoral stem are frequently made of titanium with a porous coating to facilitate bone in-growth. The acetabular cup and implant head in metal-on-metal implants are made of cobalt-chromium alloys. There are also variations available where the acetabular cup allows for placement of an insert made out of polyethylene and the head is made of cobalt-chromium; these implant devices are not the subject of this presentation.

Issues of Concern


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