Ellapparadja Pregash, Mahajan Vivek, Atiya Sami, Sankar Biju, Deep Kamal
Golden Jubilee National Hospital, Clydebank, Scotland - UK.
Hip Int. 2016 Sep 29;26(5):438-443. doi: 10.5301/hipint.5000368. Epub 2016 Apr 25.
The success of total hip arthroplasty (THA) depends on the restoration of 2 important parameters - hip offset and leg length. Leg length discrepancy (LLD) after THA is associated with back pain, gait disorder, general patient dissatisfaction and aseptic loosening. Hence it is of utmost importance to minimise LLD.
This is a retrospective study where we compared the reproduction of leg lengths between navigated THA group (152 patients) and nonnavigated THA group (57 patients). The leg lengths were measured radiologically using Ranawat technique on AP pelvic radiograph.
In the navigated group, the leg lengths of the reconstructed hips were restored to within 6 mm of the opposite leg in 146 patients (96.05%) while 6 patients (3.94%) had LLD of more than 6 mm. In the nonnavigated group, 29 patients (51%) had their leg lengths restored within 6 mm of the opposite leg while the remaining 28 patients (49%) had their LLD greater than 6 mm. Statistical analysis of the 2 pairs of LLD measurements (navigated hip and nonnavigated group) using Mann-Whitney U-test revealed significant difference between these two groups (p<0.001).
Based on our results we conclude that computer navigation is an excellent tool to facilitate the successful reproduction of leg length in THA.
全髋关节置换术（THA）的成功取决于两个重要参数的恢复——髋关节偏移和腿长。THA术后的腿长差异（LLD）与背痛、步态障碍、患者总体不满以及无菌性松动相关。因此，将LLD降至最低至关重要。
这是一项回顾性研究，我们比较了导航THA组（152例患者）和非导航THA组（57例患者）腿长的恢复情况。使用Ranawat技术在骨盆前后位X线片上通过影像学测量腿长。
在导航组中，146例患者（96.05%）重建髋关节的腿长恢复到与对侧腿相差6mm以内，而6例患者（3.94%）的LLD超过6mm。在非导航组中，29例患者（51%）的腿长恢复到与对侧腿相差6mm以内，其余28例患者（49%）的LLD大于6mm。使用曼-惠特尼U检验对两组LLD测量值（导航髋关节组和非导航组）进行统计分析，结果显示两组之间存在显著差异（p<0.001）。
基于我们的结果，我们得出结论，计算机导航是促进THA中腿长成功恢复的优秀工具。
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