Metal on Metal Bearings in Hip Arthroplasty

摘要: Periprosthetic osteolysis caused by wear debris released from the bearing surface of polyethylene components is major problem in contemporary hip arthroplasty. Several types metal on prostheses were developed 1960s, but mid 1970s they completely displaced bearings. There have been several generations all with significant variation design, tolerances, and quality. A number these hips survived for more than 25 years because low rates minimal osteolysis. Identification characteristics that contributed to long term function important. The historical development clinical results arthroplasties are presented. Factors led abandonment bearings related : (1) early success Charnley prosthesis ; (2) frictional torque issue (3) carcinogenesis concerns (4) sensitivity (5) high infection (6) increased strain periprosthetic bone fatigue fractures acetabular floor. accumulated experience date enables one evaluate factors a different perspective makes use newer viable option younger patients.