Postoperative anterior knee pain was evaluated in a consecutive series of 138 knees in 108 patients with rheumatoid arthritis treated by total knee replacement with Mark I Insall-Burstein prostheses. No knee had primary patellar resurfacing, and in the 119 knees followed up for a mean of 63.9 months, none had secondary resurfacing. Anterior knee pain was absent in 87 knees (73%), mild in 16 (13.5%) and moderate or severe in 16 (13.5%). The height of the patella above the prosthetic joint line was the only variable which was directly related to the incidence of anterior knee pain. The sensitivity and specificity of patellar height measurements for identifying patients with or without pain were derived. From these data, a selective policy of resurfacing the patella in those at risk was adopted. Choosing a patellar height of 15 mm or less, patellar resurfacing could be avoided in 80% of patients likely to have no pain, and the patella could be resurfaced in 65% of those likely to have anterior knee pain.
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机译：通过Mark I Insall-Burstein假体全膝关节置换术治疗的108名类风湿性关节炎患者，在连续138个膝关节系列中评估了术后前膝痛。膝关节无一次primary骨表面置换，在119例膝关节中平均随访63.9个月，无膝关节继发表面置换。前膝痛在87个膝关节中没有出现（73％），轻度膝关节中有16个（13.5％），中度或重度膝关节中有16个（13.5％）。 above关节上方的joint骨高度是唯一与膝前痛发生率直接相关的变量。推导了tell骨高度测量在识别有无疼痛的患者中的敏感性和特异性。从这些数据中，采取了一种选择性策略，在处于危险中的人中重新the骨。选择pa骨高度为15 mm或更小，可以避免80％可能没有疼痛的患者进行pa骨表面重铺，并且可以将65％可能患有前膝痛的患者的surface骨重铺。
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