大腿骨頭壊死症に対するbipolar型人工骨頭置換術の成績

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  • Results of Bipolar Endoprosthetic Arthroplasty in Avascular Necrosis of Femoral Head.

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In this study, we investigated the results of bipolar endoprosthesis of the acetabular side in the avascular necrosis of the head.<br>We selected 31 joints of 23 cases who had been operated on for more than 3 years ago. The motive was, idiopathic 16 joints, alcohol 6 joints, steroid 5 joints and after fracture of the femoral neck 5 joints. Acetabular reaming was done in 6 cases, 7 joints. We investigated (1)proximal migration of the outer head, (2) existence of the roof osteophyte and (3) existence of osteolysis with the passing year's X ray.<br>(1) Proximal migration was seen in 4 joints (12.9%), in the 3 joints, acetabular reaming was done.<br>(2) Roof osteophyte was seen in the 6 joints that was not seen in the proximal migration.<br>Bipolar endoprosthesis is elective for the avascular necrosis of the femoral head.<br>We concluded that acetabular migration is the factor the bad results and that roof osteophyte contributes to the stability of the outer head.

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