Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand.
Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand; Department of Engineering Science, The University of Auckland, Auckland, New Zealand.
J Biomech. 2022 Sep;142:111265. doi: 10.1016/j.jbiomech.2022.111265. Epub 2022 Aug 18.
Determination of the hip joint centre (HJC) is important to accurately estimate hip joint motion, moments and muscle forces. The most accurate method for HJC estimation without medical imaging is an area of interest in the biomechanics community, especially in a paediatric population, which has not been widely evaluated. HJC locations were calculated by sphere-fitting to the acetabulum of three-dimensional pelvises segmented from 333 CT scans of children aged 4 to 18 years old. Three methods for determining the HJC were compared: regression equations, linear scaling, and shape model prediction. The new regression equations developed in this study produced Euclidean distance errors of 6.23 mm ± 2.90 mm. Linear scaling of paediatric bone produced errors of 3.90 mm ± 2.52 mm and adult bone scaling of 5.45 mm ± 3.26 mm. Prediction of the HJC using a paediatric statistical shape model produced mean Euclidian distance errors of 2.95 mm ± 1.65 mm. Overall, shape model prediction of the HJC produced the lowest errors, with linear scaling of a mean paediatric pelvis providing better estimates than regression equations.
髋关节中心（HJC）的确定对于准确估计髋关节运动、力矩和肌肉力量非常重要。在没有医学成像的情况下，最准确的 HJC 估计方法是生物力学领域的一个研究热点，特别是在儿科人群中，这一方法尚未得到广泛评估。通过对 333 名 4 至 18 岁儿童 CT 扫描的三维骨盆进行感兴趣区域分析，计算了 HJC 的位置。比较了三种确定 HJC 的方法：回归方程、线性比例和形状模型预测。本研究开发的新回归方程产生的欧几里得距离误差为 6.23mm ± 2.90mm。儿童骨骼的线性比例产生 3.90mm ± 2.52mm 的误差，而成人骨骼的比例为 5.45mm ± 3.26mm。使用儿科统计形状模型预测 HJC 产生的平均欧几里得距离误差为 2.95mm ± 1.65mm。总体而言，HJC 的形状模型预测产生的误差最小，平均儿科骨盆的线性比例提供的估计值优于回归方程。
