In 1960 Charnley of Britain pioneered in using bone cement to fix the combination of stainless steal femoral compornent and polyethylene acetabulum cup. These total hip arthroplasties showed outstanding clinical result for over 20 years. On the other hand, the use of cementless prostheses without cement was started around 1980. Any of these techniques, problems of infection and dislocation still exist during early post-operative phase. And also exist the problem of aseptic loosening gradually during long term use. Today, I would like to talk mainly about the mechanisms of the prostheses to become loose, whatever the surgical technique goes well and also about the recent trend of MIS (minimally invasive surgery)
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