Blendea Sorin, Troccaz Jocelyne, Ravey Jean-Noel, Merloz Philippe
Laboratoire TIMC, Joseph Fourier University, Grenoble, France.
Comput Aided Surg. 2007 May;12(3):176-80. doi: 10.3109/10929080701374265.
The present study tested the accuracy of an image-free navigation system used for total hip arthroplasty (THA). Two parallel, prospective studies were performed: one on real patients and the other on pelvic phantoms. We used a comparison between the intra-operative cup orientation, as displayed by the navigation system, and the post-operative cup position, as measured on CT data. The mean intrinsic overall error (+/- standard deviation) found in the phantom study was 2.6 +/- 1.1 degrees (range: 1.5-4.4 degrees ) for cup abduction, and 0.9 +/- 0.7 degrees (range: 0-2.5 degrees ) for cup anteversion. The system was less accurate in the clinical operative setting. The evaluation model was able to identify, and more importantly quantify, the clinically induced error. Ameliorating this would improve the clinical accuracy of the system.
本研究测试了用于全髋关节置换术（THA）的无图像导航系统的准确性。进行了两项平行的前瞻性研究：一项针对真实患者，另一项针对骨盆模型。我们比较了导航系统显示的术中髋臼方向与CT数据测量的术后髋臼位置。在模型研究中，发现髋臼外展的平均内在总误差（±标准差）为2.6±1.1度（范围：1.5 - 4.4度），髋臼前倾角的平均内在总误差为0.9±0.7度（范围：0 - 2.5度）。该系统在临床手术环境中的准确性较低。评估模型能够识别，更重要的是量化临床引起的误差。改善这一点将提高系统的临床准确性。
