Department of Sports Rehabilitation, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3, Kasumi, Minami-ku, Hiroshima, 734-8553, Japan.
Department of Sports Rehabilitation, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3, Kasumi, Minami-ku, Hiroshima, 734-8553, Japan.
Foot (Edinb). 2022 May;51:101911. doi: 10.1016/j.foot.2022.101911. Epub 2022 Feb 11.
Hallux valgus (HV) entails changes in the alignment of the rotating sesamoids and a shift of the abductor hallucis muscle (ABH) in the plantar direction, decreasing the abductor force. Load on the foot while walking may change the sesamoid rotation angle (SRA). Nevertheless, no study has investigated the relationship between the change in SRA during assumed walking and ABH muscle size. The aim of our study was to examine the changes in SRA at different foot postures assumed to generate skeletal alignments during walking and muscle size of the ABH in participants with HV and to discuss the association between the change in the SRA and cross-sectional area (CSA) of the ABH. Thirteen female participants were recruited and divided into the HV and non-HV groups according to the HV angle. The SRA and cross-sectional area of the ABH were measured using B-mode ultrasound. The SRA was measured under four conditions; sitting, standing, mid-stance, and pre-swing posture. The CSA was assessed in the supine position. In all postures, the SRA increased more in the HV group than in the non-HV group (p < 0.05). The change in the SRA at the pre-swing posture was greater in the HV group than in the non-HV group (p < 0.05). The change in the SRA at pre-swing posture negatively correlated with the CSA of the ABH in the HV group (r = -0.554, p < 0.05). In the HV group, increasing the load on the forefoot enhanced the sesamoid rotation. Abductor torque on the ABH decreased with ABH displacement as the sesamoids moved laterally in the pre-swing. Repeated walking increased sesamoid rotation and led to HV progression. Therefore, it may be beneficial to use an orthosis or arch pad that corrects pronation of the metatarsal with the rotation of the sesamoids.
拇外翻（HV）涉及旋前籽骨的排列变化和拇展肌（ABH）在足底方向的移位，从而降低了外展力。行走时足部的负荷可能会改变籽骨旋转角度（SRA）。然而，尚无研究调查行走时 SRA 变化与 ABH 肌肉大小之间的关系。我们的研究目的是检查 HV 参与者在行走时产生骨骼排列的不同足部姿势下 SRA 的变化以及 ABH 肌肉大小，并讨论 SRA 变化与 ABH 横截面积（CSA）之间的关系。招募了 13 名女性参与者，并根据 HV 角将其分为 HV 和非 HV 组。使用 B 型超声测量 SRA 和 ABH 的横截面积。SRA 在坐姿、站姿、中间站立和预摆动姿势下进行测量。CSA 在仰卧位进行评估。在所有姿势下，HV 组的 SRA 增加量均大于非 HV 组（p < 0.05）。HV 组在预摆动位的 SRA 变化大于非 HV 组（p < 0.05）。HV 组中，预摆动位 SRA 的变化与 ABH 的 CSA 呈负相关（r = -0.554，p < 0.05）。在 HV 组中，前脚负荷的增加增强了籽骨的旋转。随着籽骨向外侧移动，ABH 的外展扭矩随 ABH 的位移减小而减小。反复行走增加了籽骨的旋转，导致 HV 进展。因此，使用可以纠正跖骨旋前和籽骨旋转的矫形器或足弓垫可能会有所帮助。
