摘要目的 探讨后稳型旋转平台高屈曲假体膝关节置换的手术适应证及其在改善膝关节功能方面的优越性.方法 应用前瞻性随机对照研究方法,将2009年2月至2009年4月经门、急诊收治的膝关节骨关节炎患者75例94膝随机分为两组,一组接受后稳型旋转平台普通假体置换(PFC sigma RP假体),另一组接受后稳型旋转平台高屈曲假体置换(PFC sigma RPF假体).两组患者的一般情况及术前特种外科医院(the Hospital for Special Surgery,HSS)膝关节评分和膝关节活动范围差异均无统计学意义.根据患者入院顺序再次随机化,由3名术者抽签决定各自的手术对象.术后1、6、12及18个月复查HSS评分及膝关节活动范围,术后18个月对患者进行满意度问卷调查.所有患者术前、术后第3天、3、6、12和18个月拍摄术侧膝关节正、侧位和双下肢站立位全长X线片.结果 70例87膝完成最终随访,普通组33例46膝,高屈曲组34例41膝.术后18个月普通组HSS膝关节评分(92.4±5.0)分,高屈曲组(94.7±7.0)分,两组差异无统计学意义;普通组膝关节活动范围123.0°±15.3°,高屈曲组131.9°±14°,两组差异有统计学意义,高屈曲组大于普通组,但未达到样本量估计时所设定的20°.术后18个月,两组患者的手术满意率均为100%.结论 高屈曲假体与普通假体置换的近期疗效相似.高屈曲假体未显示出在膝关节屈曲活动范围方面的优势.

abstractsObjective To explore the indication and the functional advantages of the high-flexion posterior stabilized (PS) rotating-platform mobile-bearing (RP-MB) total knee system. Methods A prospective randomized, controlled trial was performed. Osteoarthritis was the indicators for total knee arthroplasty.From Feb. 2009 to Apr. 2009, 75 patients (94 knees) were randomly assigned to to receive either a highflexion PS, RP-MB total knee system(PFC sigma RPF) or a standard one (PFC sigma RP). There were no statistical difference in the baselines, the preoperative scores of the Hospital for Special Surgery (HSS) and the knee range of motion (ROM) of both groups. The functional status were assessed with Hospital for Special Surgery and the ROM of the knee at the postoperative 1, 6, 12, 18 months. The satisfaction rates were assessed at the postoperative 18 months. The radiographic measurements were t assessed at the postoperative 3days and 3, 6, 12, 18 months. Results A total of 70 participants (87 knees) completed the 18-month followup. At the time of the final follow-up, the average Hospital for Special Surgery knee score was 92.4±5.0points in the standard group and 94.7±7.0 points in the high-flex ion group. The difference was not statistically significant(P ＞0.05). The average maximal flexion was 131.9±14 degrees in the high-flexion group and 123.0±15.3 degrees in the standard group. There was a statistical difference. But it was not enough to confirm our hypothesis that the difference should be higher than 10 degrees. Moreover, the satisfaction rate were 100% in both groups, and no statistical significant difference was found. Conclusion No significant differences were found between standard and high-flexion posterior-stabilized rotating-platform mobile-bearing total knee prostheses in terms of clinical outcomes or range of motion.