Zhang Xianyi, Aeles Jeroen, Vanwanseele Benedicte
Human Movement Biomechanics Research Group, Department of Kinesiology, KU Leuven, Leuven, Belgium.
Human Movement Biomechanics Research Group, Department of Kinesiology, KU Leuven, Leuven, Belgium.
Gait Posture. 2017 May;54:290-294. doi: 10.1016/j.gaitpost.2017.03.030. Epub 2017 Mar 31.
Over-pronated feet are common in adults and are associated with lower limb injuries. Studying the foot muscle morphology and foot kinematic patterns is important for understanding the mechanism of over-pronation related injuries. The aim of this study is to compare the foot muscle morphology and foot inter-segmental kinematics between recreational runners with normal feet and those with asymptomatic over-pronated feet. A total of 26 recreational runners (17 had normal feet and 9 had over-pronated feet) participated in this study and their foot type was assessed using the 6-item Foot Posture Index. Selected foot muscles were scanned using an ultrasound device and the scanned images were processed to measure the thickness and cross-sectional area of the muscles. Muscles of interest include abductor hallucis, abductor digiti minimi, flexor digitorum brevis and longus, tibialis anterior and peroneus muscles. Foot kinematic data during walking was collected using a 3D motion capture system incorporating the Oxford Foot Model. The results show that individuals with over-pronated feet have larger size of abductor hallucis, flexor digitorum brevis and longus and smaller abductor digiti minimi than controls. Higher rearfoot peak eversion and forefoot peak supination during walking were observed in individuals with over-pronated feet. However, during gait the forefoot peak abduction was comparable. These findings indicate that in active asymptomatic individuals with over-pronated feet, the foot muscle morphology is adapted to increase control of the foot motion. The morphological characteristics of the foot muscles in asymptomatic individuals with over-pronated feet may affect their foot kinematics and benefit prevention from injuries.
足过度内旋在成年人中很常见，并且与下肢损伤有关。研究足部肌肉形态和足部运动学模式对于理解与过度内旋相关损伤的机制很重要。本研究的目的是比较正常足的业余跑步者和无症状足过度内旋的业余跑步者之间的足部肌肉形态和足部节段间运动学。共有26名业余跑步者（17名足正常，9名足过度内旋）参与了本研究，他们的足型通过6项足部姿势指数进行评估。使用超声设备对选定的足部肌肉进行扫描，并对扫描图像进行处理以测量肌肉的厚度和横截面积。感兴趣的肌肉包括拇展肌、小趾展肌、趾短屈肌和趾长屈肌、胫骨前肌和腓骨肌。使用结合牛津足部模型的3D运动捕捉系统收集步行过程中的足部运动学数据。结果表明，足过度内旋的个体拇展肌、趾短屈肌和趾长屈肌的尺寸比对照组大，而小趾展肌较小。在足过度内旋的个体中观察到步行过程中后足峰值外翻和前足峰值内旋更高。然而，在步态中前足峰值外展相当。这些发现表明，在足过度内旋的无症状活跃个体中，足部肌肉形态会发生适应性变化以增加对足部运动的控制。足过度内旋的无症状个体的足部肌肉形态特征可能会影响其足部运动学，并有助于预防损伤。
