Department of Orthopaedic Surgery, University of Pittsburgh, 3820 South Water Street, Pittsburgh, PA 15203.
University of Pittsburgh.
J Biomech Eng. 2024 Dec 1;146(12). doi: 10.1115/1.4066466.
The purpose of this study was to identify side-to-side and sex-based differences in hip kinematics during a unilateral step-up from deep flexion. Twelve (eight men, four women) asymptomatic young adults performed a step ascent motion while synchronized biplane radiographs of the hip were collected at 50 images per second. Femur and pelvis position were determined using a validated volumetric model-based tracking technique that matched digitally reconstructed radiographs created from subject-specific computed tomography (CT) bone models to each pair of synchronized radiographs. Hip kinematics and side-to-side differences were calculated and a linear mixed effects model evaluated sex-based differences. Women were on average 10.2 deg more abducted and 0.2 mm more medially translated than men across the step up motion (p < 0.001). Asymmetry between hips was up to 14.1 ± 12.1 deg in internal rotation and 1.3 ± 1.4 mm in translation. This dataset demonstrates the inherent asymmetry during movements involving unilateral hip extension from deep flexion and may be used provide context for observed kinematics differences following surgery or rehabilitation. Previously reported kinematic differences between total hip arthroplasty and contralateral hips may be well within the natural side-to-side differences that exist in asymptomatic native hips.
本研究旨在确定在从深度屈曲到单侧单步上升过程中髋关节运动的侧别和性别差异。12 名（8 名男性，4 名女性）无症状的年轻成年人在进行单步上升运动的同时，以每秒 50 帧的速度同步采集双平面髋关节射线照片。股骨和骨盆的位置是通过一种经过验证的基于容积模型的跟踪技术来确定的，该技术将从特定于个体的计算机断层扫描 (CT) 骨骼模型创建的数字重建射线照片与每对同步射线照片进行匹配。计算了髋关节运动的运动学和侧别差异，并使用线性混合效应模型评估了性别差异。与男性相比，女性在整个单步上升运动中平均外展 10.2°，内收 0.2mm（p<0.001）。髋关节之间的不对称性在 14.1°±12.1°的内旋和 1.3mm±1.4mm 的平移范围内。该数据集展示了涉及单侧髋关节从深度屈曲到伸展的运动中的固有不对称性，并且可以用于为手术后或康复后的运动学差异提供背景。先前报告的全髋关节置换术和对侧髋关节之间的运动学差异可能很好地在无症状的天然髋关节中存在的自然侧别差异范围内。
