高位脱臼股に対するKTプレートを用いた初回人工股関節全置換術についての検討

Short-term Results in Primary Total Hip Arthroplasty for Severe Dysplastic or Dislocated Hips with KT Cross-plate

　高位脱臼股に対する人工股関節全置換術（THA）では，臼蓋の骨欠損が問題となるが，大きな移植骨では術後の圧潰を生じることがある．移植骨圧潰予防のため，KTプレートを用いて行った高位脱臼股に対する初回THA 29例30股（平均年齢57.2歳，平均観察期間2.3年）の短期成績を報告する．移植骨の被覆率，骨癒合，圧潰の有無，カップのlooseningを調査した．移植骨の被覆率は平均64.5％であり，全例で骨癒合を認め，圧潰を生じた例はなかった．1mm以下のradiolucent lineを2例に認めた．短期成績ではあるが，高位脱臼股に対する初回THAにKTプレートは有用と考えられる．

　We reported short-term results in primary total hip arthroplasty (THA) for severe dysplastic or dislocated hips with KT cross-plates to prevent grafted bone collapse. Subjects were 29 patients (average 57.2 years old) and 30 hips undergoing THA with KT cross-plates. Average follow-up was 2.3 years. The coverage ratio, grafted bone union and collapse, and cup loosening were investigated. The average coverage ratio was 64.5％. All grafted bones were united, and no grafted bone collapsed. Radiolucent lines of less than 1mm around the cup were seen in two cases. The KT cross-plate is thus useful in primary THA for severe dysplastic or dislocated hips.