Kaufer H, Matthews L S
J Bone Joint Surg Am. 1981 Apr;63(4):545-59.
We studied eighty-two consecutive spherocentric total knee arthroplasties with an average follow-up of four years (range, two to six years). All patients had either severe preoperative instability or deformity, or both. The over-all functional improvement and symptomatic relief were excellent. Knees with preoperative instability did as well as those with preoperative deformity that were stable. The knees with preoperative valgus deformity were the most likely to have postoperative wound problems or transient nerve palsy, while those with preoperative varus deformity were much more likely to have loosening. Postoperative limb alignment of 7 to 9 degrees of valgus angulation protected against lucency and loosening. No new cases of lucency or loosening appeared after two and one-half years. The infection rate was 4 per cent and the rate of failure due to loosening was 5 per cent. The over-all reoperation rate was 9 per cent. Nine patients (with eleven arthroplasties) died during the follow-up period.
我们研究了连续的82例球形中心全膝关节置换术，平均随访4年（范围为2至6年）。所有患者术前均存在严重不稳定或畸形，或两者皆有。总体功能改善和症状缓解情况良好。术前不稳定的膝关节与术前稳定的畸形膝关节效果相当。术前有外翻畸形的膝关节最易出现术后伤口问题或短暂性神经麻痹，而术前有内翻畸形的膝关节则更易出现松动。术后肢体呈7至9度外翻角对线可预防透亮区和松动。两年半后未出现新的透亮区或松动病例。感染率为4%，因松动导致的失败率为5%。总体再手术率为9%。9例患者（11次关节置换术）在随访期间死亡。
