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異常音を生じ脱転破損前に再置換を施行した京セラ製人工股関節ABSカップの1例を経験したので考察を加え報告する.セメントレスABS HAシェルはセラミック骨頭とセラミックライナーの過度の密着により逸脱することがある.破損症例の7割に前駆症状を伴い,ほとんどがその後1カ月以内に破損すると報告されている.破損後の再置換術はセラミック片が残存し成績不良で,摺動面の選択肢が限られるなどのデメリットがあるため,異常音などの前駆症状があれば早期に再置換術が必要である.
We report a case in which a ABS cup (Kyocera, Kyoto, Japan) produced an abnormal sound and revision THA was performed before progression to dissociation or fracture. Cementless ABS HA shells sometimes dissociate because of over-crimp with a ceramic ball and a ceramic liner. Approximately 70% of the cases in which fractures have occurred have been accompanied by prodromal symptoms, and most symptomatic cases have resulted in implant fracture within 1 month after the prodromal symptoms developed. The surgical outcome of revision THA after fractures has not been good, and there is the drawback of a limited selection of bearing surfaces. Thus, implant revision should be considered when any prodromal symptoms, such as an abnormal sound, develop.
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