摘要目的 探讨计算机辅助全髋关节置换术前模板测量方法 的准确性. 方法 使用LINK Preop PlanTM计算机辅助设计系统对2008年3月-12月30例初次单侧全髋关节置换术患者(男11例,女19例;年龄42～85岁,平均56岁)进行术前模板测量,分析术前计划与术中实际使用假体型号之间的符合情况,并比较术前与术后双下肢长度差异. 结果 术前计划与实际使用的假体型号有良好的符合率:髋臼假体完全符合19例(63%),相差1号8例(27%),相差≥2号3例(10%);股骨假体完全符合19例(63%),相差1号9例(30%),相差≥2号2例(7%).股骨假体中骨水泥型相差在1号以内的16例(89%),非骨水泥型相差在1号以内的12例(100%),骨水泥型和非骨水泥型股骨假体的符合率差异无统计学意义(P>0.05).比较术前计划与术后双下肢长度差异:术前影像学测量为(9.0±8.5)mm,术后影像学测量为(1.1±2.4)mm,术后双下肢不等长明显纠正(P<0.01). 结论术前计划对于全髋关节置换术的顺利实施有重要意义,计算机辅助术前模板测量可准确预测假体型号,有利于纠正双下肢不等长.

abstractsObjective To study the precision of computer-aided preoperative templating for total hip arthroplasty. Methods Thirty patients (11 males, 19 females; age ranged from 42 to 85 years, mean 56 years) received unilateral total hip arthroplasty from March 2008 to December 2008. Preoperative tem-plating was done with LINK -Preop-PlanTM to compare the size of the planned hip joint with the size of the prosthesis, as well as the discrepancy of the limbs before and after operation. Results The predicted sizes of the prosthesis corresponded well with the actual ones. The cup size of the prosthesis completely matched the actual ones in 19 patients (63%), and the variation was within 1 size in 8 patients (27%) and ≥2 sizes in 3 patients (10%). The stem size of the prosthesis completely matched the actual ones in 19 patients (63%), and the variation was within 1 size in 9 patients (30%) and ≥2 sizes in 2 patients (7%). The variation of the cemented and cementless stem size of the prosthesis was within 1 size in 16 patients (89%) and 12 patients (100%), respectively, with no statistical difference (P > 0.05). The discrepancy of limb length was (9.0±8.5) mm preoperatively and (1.1±2.4) mm postoperatively. Conclusions Preoperative planning is of paramount significance in total hip arthroplasty. Computer-ai-ded preoperative templating can accurately anticipate the type of the prosthesis, which is helpful in correc-ting the discrepancy in leg length.