Department of Mechanical and Manufacturing Engineering, Aalborg University, Denmark.
Gait Posture. 2013 Sep;38(4):1044-7. doi: 10.1016/j.gaitpost.2013.01.025. Epub 2013 Mar 1.
We investigated the accuracy of the regression equations by Bell et al., Davis III et al. and Harrington et al. for hip joint centre (HJC) estimation against the gold standard of computerised tomography (CT) measurements of HJC for 18 patients with metal-on-metal hip resurfacing arthroplasty (MoMHRA). The HJCs were estimated based on the position of the left and right Anterior Superior Iliac Spine (ASIS) and the left and right Posterior Superior Iliac Spine (PSIS) identified from a CT scan. Of the three tested regression equations, only those of Harrington et al. produced results that were not significantly different from the patient's 'true' HJCs as measured from the CT scan in all three directions when analysing left and right hips together for both resurfaced and native hips. When native and resurfaced hips were pooled and analysed for left and right, separately, the Harrington et al. regression equations showed significantly different results in the ML direction. Similar estimation errors were observed for native and resurfaced hips. Since none of the methods tested performed particularly well, we suggest using medical imaging if accurate estimates of HJCs are required.
我们研究了 Bell 等人、Davis III 等人和 Harrington 等人的回归方程在估计髋关节中心（HJC）时的准确性，这些方程是针对 18 例金属对金属髋关节表面置换术（MoMHRA）患者的 HJC 进行计算机断层扫描（CT）测量的金标准。HJC 是基于 CT 扫描中识别出的左侧和右侧髂前上棘（ASIS）以及左侧和右侧髂后上棘（PSIS）的位置来估计的。在测试的三个回归方程中，只有 Harrington 等人的方程在分析双侧髋关节时，对于所有三个方向的左侧和右侧髋关节，其结果与从 CT 扫描测量的患者“真实”HJC 没有显著差异。当将原始和表面置换的髋关节混合并分别进行分析时，Harrington 等人的回归方程在 ML 方向显示出明显不同的结果。对于原始和表面置换的髋关节，也观察到了类似的估计误差。由于没有一种方法表现得特别好，因此我们建议如果需要准确估计 HJC，则使用医学成像。
