Bipolar 型人工骨頭置換術後に inner head が脱臼した1例

概要

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We experienced one case of dislocation of the inner head in biporal hip prosthesis caused by the wear of the HDP liner. The case, a 82 year-old woman with left femoral neck fracture was treated with biporal hip prosthesis, without self-centering mechanism, approximately 11 years ago. She had severe pain in her left hip while sitting down on her heels, and was unable to walk. Roentogenogram of the hip revealed extreme varus position of the outer head and dislocation of the inner head in bipolar hip prosthesis. Surgical exploration revealed the outer head that was fixed in the varus position, hyperplastic granulation in acetabulum, and manifest wearing of all inner HDP liners. This suggested that the wear occurred due to impingement between the stem neck and outer head fixed in the varus position. In conclusion, we should follow-up carefully after operation for a long period of time, and help the patient resume proper daily activities.
西日本整形・災害外科学会の論文