A reduced capacity of plantar flexors and other muscles to extend the hip and knee during gait was shown in modelling studies when the tibial torsion angle is > 30° than normal. The aim of the current study was to determine if patients with increased or decreased tibial torsion show deviating muscle activations in knee and hip extensors in surface electromyography (EMG).

Patients with CT confirmed increased tibial torsion (n = 19, ITT), decreased tibial torsion (n = 21, DTT) and age-matched healthy controls (n = 20) were included in this retrospective study. Additionally, kinematic and kinetic data were recorded during three-dimensional gait analysis. Surface EMG was recorded for vastus medialis and medial hamstrings. Statistical parametric mapping with a one-way ANOVA and post-hoc Bonferroni corrected two-sample t-tests were used to obtain differences in joint angles and moments. ITT and DTT showed an increased and decreased external foot progression angle, respectively. No additional muscle activations in vastus medialis and medial hamstrings were found in both patient groups compared to controls. DTT showed an increased hip flexion through parts of the gait cycle and both patient groups had a decreased knee extension moment in terminal stance. Our hypothesis of deviating muscle activation had to be rejected. It could be that in most orthopaedic patients the amount of exceeding tibial torsion is too low to cause substantial deviations in gait and muscle activation patterns.

建模研究显示，当胫骨扭转角比正常情况下 > 30° 时，足底屈肌和其他肌肉在步态过程中伸展髋关节和膝关节的能力降低。本研究的目的是确定胫骨扭转增加或减少的患者在表面肌电图 (EMG) 中是否显示膝关节和髋关节伸肌的肌肉活动偏离。

CT 证实胫骨扭转增加（n = 19，ITT），胫骨扭转减少（n = 21，DTT）和年龄匹配的健康对照（n = 20）被纳入这项回顾性研究。此外，在三维步态分析过程中记录了运动学和动力学数据。记录股内侧肌和内侧腘绳肌的表面肌电图。使用单向方差分析和事后 Bonferroni 校正的两个样本 t 检验的统计参数映射来获得关节角度和力矩的差异。ITT 和 DTT 分别显示出增加和减少的外足前进角。与对照组相比，两组患者均未发现股内侧肌和内侧腘绳肌有额外的肌肉激活。DTT 显示在步态周期的部分过程中髋关节屈曲增加，并且两个患者组在终末站立时的膝关节伸展力矩均减少。我们关于偏离肌肉激活的假设必须被拒绝。可能是在大多数骨科患者中，过度的胫骨扭转量太低，无法导致步态和肌肉激活模式的显着偏差。