Pedersen D R, Brand R A, Davy D T
Department of Orthopaedic Surgery, University of Iowa, Iowa City 52242, USA.
J Biomech. 1997 Sep;30(9):959-65. doi: 10.1016/s0021-9290(97)00041-9.
Locations, magnitudes, and directions of pelvic muscle and acetabular contact forces are important to model the effects of abnormal conditions (e.g., deformity, surgery) of the hip accurately. Such data have not been reported previously. We computed the three-dimensional locations of all pelvic muscle and acetabular contact forces during level gait. The approach first required computation of the intersegmental joint resultant forces and moments using limb displacement history, foot-floor forces, and estimated limb inertial properties from one subject. The intersegmental resultant moments were then distributed to the muscles using a 47-element muscle model and a non-linear optimization scheme. Muscle forces were vectorally subtracted from the intersegmental resultants to compute the acetabular contact forces. While the peak joint force magnitudes are similar to those reported previously for the femur, the directions of pelvic contact forces and muscle forces varied considerably over the gait cycle. These variations in contact force directions and three-dimensional forces could be as important as the contact force magnitudes in performing experimental or theoretical studies of loads and stresses in the periacetabular region.
骨盆肌肉和髋臼接触力的位置、大小和方向对于准确模拟髋关节异常情况（如畸形、手术）的影响至关重要。此前尚未有此类数据的报道。我们计算了平地行走过程中所有骨盆肌肉和髋臼接触力的三维位置。该方法首先需要利用一名受试者的肢体位移历史、足底力以及估计的肢体惯性特性来计算节段间关节合力和力矩。然后，使用一个包含47个元素的肌肉模型和非线性优化方案，将节段间合力矩分配到各肌肉。从节段间合力中矢量减去肌肉力以计算髋臼接触力。虽然峰值关节力大小与先前报道的股骨峰值力大小相似，但骨盆接触力和肌肉力的方向在步态周期中变化很大。在进行髋臼周围区域载荷和应力的实验或理论研究时，接触力方向和三维力的这些变化可能与接触力大小同样重要。
