Auckland Bioengineering Institute and Department of Engineering Science, University of Auckland, Auckland, NEW ZEALAND.
Centre for Health, Exercise and Sports Medicine, Department of Physiotherapy, the University of Melbourne, Melbourne, Victoria, AUSTRALIA.
Med Sci Sports Exerc. 2022 Nov 1;54(11):1831-1841. doi: 10.1249/MSS.0000000000002971. Epub 2022 Jun 11.
The magnitude and location of hip contact force influence the local mechanical environment of the articular tissue, driving remodeling. We used a neuromusculoskeletal model to investigate hip contact force magnitudes and their regional loading patterns on the articular surfaces in those with femoroacetabular impingement (FAI) syndrome and controls during walking.
An EMG-assisted neuromusculoskeletal model was used to estimate hip contact forces in eligible participants with FAI syndrome ( n = 41) and controls ( n = 24), walking at self-selected speed. Hip contact forces were used to determine the average and spread of regional loading for femoral and acetabular articular surfaces. Hip contact force magnitude and region of loading were compared between groups using statistical parametric mapping and independent t -tests, respectively ( P < 0.05).
All of the following findings are reported compared with controls. Those with FAI syndrome walked with lower-magnitude hip contact forces (mean difference, -0.7 N·BW -1 ; P < 0.001) during first and second halves of stance, and with lower anteroposterior, vertical, and mediolateral contact force vector components. Participants with FAI syndrome also had less between-participant variation in average regional loading, which was located more anteriorly (3.8°, P = 0.035) and laterally (2.2°, P = 0.01) on the acetabulum but more posteriorly (-4.8°, P = 0.01) on the femoral head. Participants with FAI syndrome had a smaller spread of regional loading across both the acetabulum (-1.9 mm, P = 0.049) and femoral head (1 mm, P < 0.001) during stance.
Compared with controls, participants with FAI syndrome walked with lower-magnitude hip contact forces that were constrained to smaller regions on the acetabulum and femoral head. Differences in regional loading patterns might contribute to the mechanobiological processes driving cartilage maladaptation in those with FAI syndrome.
髋关节接触力的大小和位置会影响关节组织的局部力学环境，从而推动重塑过程。我们使用神经肌肉骨骼模型来研究患有髋关节撞击症（FAI）综合征和对照组的个体在行走过程中髋关节接触力的大小及其在关节表面的区域性负荷模式。
使用肌电图辅助的神经肌肉骨骼模型来估计 FAI 综合征（n=41）和对照组（n=24）个体在自选速度下行走时的髋关节接触力。髋关节接触力用于确定股骨和髋臼关节表面的区域负荷的平均值和分布。使用统计参数映射和独立 t 检验分别比较组间的髋关节接触力大小和负荷区域（P<0.05）。
与对照组相比，所有以下发现均有报道。FAI 综合征患者在站立的前半段和后半段行走时髋关节接触力较小（平均差异，-0.7 N·BW -1 ；P<0.001），并且前后向、垂直向和横向接触力矢量分量较小。FAI 综合征患者的平均区域负荷的个体间变异性也较小，负荷区域更靠前（3.8°，P=0.035）和更外侧（2.2°，P=0.01），但在股骨头处更靠后（-4.8°，P=0.01）。FAI 综合征患者在站立时髋臼（-1.9 毫米，P=0.049）和股骨头（1 毫米，P<0.001）的区域负荷分布范围较小。
与对照组相比，FAI 综合征患者行走时髋关节接触力较小，且该力局限于髋臼和股骨头的较小区域。区域性负荷模式的差异可能有助于推动 FAI 综合征患者软骨适应不良的力学生物学过程。
