抄録
Fifty-one Charnley total hip arthroplasties using improved cementing techniques were reviewed at from 5 to 12 years (mean, 8 years) after surgery. Only one acetabular and one femoral component were definitely loose based on radiographic criteria. The survival rate was 91% for the acetabular and 98% for the femoral component, with use of definite or probable loosening as the end point at 10 years. Radiolucency of the bone-cement interface was evaluated quantitatively using a CZ-scoring system devised by us. According to this CZ-scoring system, 82% of the acetabular and 94% of the femoral components were classified as stable during follow-up. The major factor for fixation failure was considered to be mechanical for the femoral component and biological for the acetabular component, according to radiological follow-up findings for these two components with definite loosening.
