A musculoskeletal model of the right lower limb was developed to estimate 3D tibial contact forces in high knee flexion postures. This model determined the effect of intersegmental contact between thigh–calf and heel–gluteal structures on tibial contact forces. This model includes direct tracking and 3D orientation of intersegmental contact force, femoral translations from in vivo studies, wrapping of knee extensor musculature, and a novel optimization constraint for multielement muscle groups. Model verification consisted of calculating the error between estimated tibial compressive forces and direct measurements from the Grand Knee Challenge during movements to ∼120° of knee flexion as no high knee flexion data are available. Tibial compression estimates strongly fit implant data during walking (R² = .83) and squatting (R² = .93) with a root mean squared difference of .47 and .16 body weight, respectively. Incorporating intersegmental contact significantly reduced model estimates of peak tibial anterior–posterior shear and increased peak medial–lateral shear during the static phase of high knee flexion movements by an average of .33 and .07 body weight, respectively. This model supports prior work in that intersegmental contact is a critical parameter when estimating tibial contact forces in high knee flexion movements across a range of culturally and occupationally relevant postures.

开发了右下肢的肌肉骨骼模型来估计膝关节高屈姿势下的 3D 胫骨接触力。该模型确定了大腿-小腿和脚跟-臀部结构之间的节间接触对胫骨接触力的影响。该模型包括节间接触力的直接跟踪和 3D 定向、体内研究的股骨平移、膝关节伸肌组织的包裹以及多元素肌肉群的新颖优化约束。模型验证包括计算估计的胫骨压缩力与膝关节弯曲 ∼120° 运动过程中来自大膝关节挑战的直接测量值之间的误差，因为没有可用的高膝关节弯曲数据。胫骨压缩估计与步行 ( R ²  = .83) 和蹲下 ( R ²  = .93) 期间的植入物数据非常吻合，均方根差分别为 0.47 和 0.16 体重。结合节段间接触，在高膝关节屈曲运动的静态阶段，模型估计的胫骨前后剪切力峰值显着降低，内侧-外侧剪切力峰值分别增加了平均 0.33 和 0.07 体重。该模型支持之前的工作，因为在估计一系列文化和职业相关姿势的高膝关节屈曲运动中的胫骨接触力时，节间接触是一个关键参数。