Koo Young-Jun, Koo Seungbum
School of Mechanical Engineering,Chung-Ang University,Seoul 06974, South Korea.
Department of Mechanical Engineering,Korea Advanced Institute ofScience and Technology,291 Daehak-ro, Yuseong-gu,Daejeon 34141, South Koreae-mail:
J Biomech Eng. 2019 Aug 1;141(8). doi: 10.1115/1.4043562.
Accurate joint kinematics plays an important role in estimating joint kinetics in musculoskeletal simulations. Biplanar fluoroscopic (BPF) systems have been introduced to measure skeletal kinematics with six degrees-of-freedom. The purpose of this study was to model knee kinematic coupling using knee kinematics during walking, as measured by the BPF system. Seven healthy individuals (mean age, 23 ± 2 yr) performed treadmill walking trials at 1.2 m/s. Knee kinematics was regressed separately for the swing and stance phases using a generalized mixed effects model. Tibial anterior translation function was y=0.20x-3.09 for the swing phase and y=0.31x-0.54 for the stance phase, where x was the flexion angle and y was the tibial anterior translation. Tibial lateral and inferior translation were also regressed separately for the stance phase and the swing phase. Tibial external rotation was y=-0.002x2+0.19x-0.64 for the swing phase and y=-0.19x-1.22 for the stance phase. The tibial adduction rotation function was also calculated separately for the stance and swing phase. The study presented three-dimensional coupled motion in the knee during the stance and swing phases of walking, and demonstrated the lateral pivoting motion found in previous studies. This expanded understanding of secondary knee motion functions will benefit musculoskeletal simulation and help improve the accuracy of calculated kinetics.
在肌肉骨骼模拟中，准确的关节运动学对于估计关节动力学起着重要作用。双平面荧光透视（BPF）系统已被引入用于测量具有六个自由度的骨骼运动学。本研究的目的是利用BPF系统测量的行走过程中的膝关节运动学来模拟膝关节运动耦合。七名健康个体（平均年龄，23±2岁）以1.2m/s的速度在跑步机上进行行走试验。使用广义混合效应模型分别对摆动期和站立期的膝关节运动学进行回归分析。摆动期胫骨向前平移函数为y = 0.20x - 3.09，站立期为y = 0.31x - 0.54，其中x为屈曲角度，y为胫骨向前平移。对于站立期和摆动期，还分别对胫骨侧向和向下平移进行了回归分析。摆动期胫骨外旋函数为y = -0.002x² + 0.19x - 0.64，站立期为y = -0.19x - 1.22。还分别计算了站立期和摆动期的胫骨内收旋转函数。该研究展示了行走站立期和摆动期膝关节的三维耦合运动，并证实了先前研究中发现的侧向枢转运动。这种对膝关节次要运动功能的进一步理解将有利于肌肉骨骼模拟，并有助于提高计算动力学的准确性。
