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首页> 外文期刊>Clinical biomechanics >Evaluation of formal methods in hip joint center assessment: an in vitro analysis.
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Evaluation of formal methods in hip joint center assessment: an in vitro analysis.

机译：髋关节中心评估中正式方法的评估：一项体外分析。

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摘要

BACKGROUND: The hip joint center is a fundamental landmark in the identification of lower limb mechanical axis; errors in its location lead to substantial inaccuracies both in joint reconstruction and in gait analysis. Actually in Computer Aided Surgery functional non-invasive procedures have been tested in identifying this landmark, but an anatomical validation is scarcely discussed. METHODS: A navigation system was used to acquire data on eight cadaveric hips. Pivoting functional maneuver and hip joint anatomy were analyzed. Two functional methods - both with and without using the pelvic tracker - were evaluated: specifically a sphere fit method and a transformation techniques. The positions of the estimated centers with respect to the anatomical center of the femoral head, the influence of this deviation on the kinematic assessment and on the identification of femoral mechanical axis were analyzed. FINDINGS: We found that the implemented transformation technique was the most reliable estimation of hip joint center, introducing a - Mean (SD) - difference of 1.6 (2.7) mm from the anatomical center with the pelvic tracker, whereas sphere fit method without it demonstrated the lowest accuracy with 25.2 (18.9) mm of deviation. Otherwise both the methods reported similar accuracy (<3mm of deviation). INTERPRETATION: The functional estimations resulted in the best case to be in an average of less than 2mm from the anatomical center, which corresponds to angular deviations of the femoral mechanical axis smaller than 1.7 (1.3) degrees and negligible errors in kinematic assessment of angular displacements.
机译：背景：髋关节中心是下肢机械轴识别的基本标志。其位置的错误会导致联合重建和步态分析方面的重大误差。实际上，在计算机辅助手术中，已经对功能性非侵入性程序进行了测试以识别这一里程碑，但很少讨论解剖学验证。方法：使用导航系统获取八具尸体臀部的数据。分析了枢纽功能操纵和髋关节解剖结构。评估了使用和不使用骨盆跟踪器的两种功能方法：特别是球体拟合方法和转换技术。分析了相对于股骨头解剖学中心的估计中心的位置，该偏差对运动学评估和对股骨机械轴的识别的影响。结果：我们发现实施的转换技术是最可靠的髋关节中心估计，采用骨盆跟踪器引入了-平均值（SD）-与解剖学中心的距离为1.6（2.7）mm，而无球体拟合方法证明了这一点最低精度，偏差为25.2（18.9）毫米。否则，两种方法都报告了相似的精度（偏差<3mm）。解释：根据功能估计，最佳情况是距解剖中心的平均距离小于2mm，这对应于股骨机械轴的角度偏差小于1.7（1.3）度，并且在运动学角度位移评估中的误差可忽略不计。

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