Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan; Center for Advanced Practice and Research of Rehabilitation, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
Clin Biomech (Bristol). 2024 Aug;118:106319. doi: 10.1016/j.clinbiomech.2024.106319. Epub 2024 Aug 2.
A flatfoot has been believed to be closely associated with the development of hallux valgus; however, the association is still controversial. Abnormal foot kinematics has been identified as a possible risk factor for the development of hallux valgus, but it remains unclear whether foot posture contributes to abnormal foot kinematics. This is the first study to investigate the differences in foot kinematics during gait between individuals with and without hallux valgus, while controlling for foot posture.
Twenty-five females with hallux valgus and 25 healthy females aged 18 to 22 were recruited. Foot posture was measured using normalized navicular height truncated and the leg-heel angle. Foot kinematic and kinetic data during gait were recorded by a three-dimensional motion capture system. To investigate the characteristics of foot kinematics in individuals with hallux valgus while controlling for foot posture, we used a propensity score matching method. The matching was obtained by using the 1:1 nearest-neighbor procedure and a caliper width of 0.2.
Twelve pairs were matched. Individuals with hallux valgus had significantly increased midfoot dorsiflexion from 56% to 80% during stance phase, rearfoot eversion from 53% to 71%, and forefoot abduction from 5% to 29% compared with control.
Individuals with hallux valgus have a flexible foot that cannot suppress the dynamic deformation of the rearfoot and midfoot during gait. To suppress the development of hallux valgus, interventions that aim to prevent dynamic deformations of the rearfoot and midfoot during gait may be necessary, regardless of their static foot posture.
平足被认为与拇外翻的发展密切相关；然而，这种关联仍然存在争议。异常的足部运动学已被确定为拇外翻发展的一个可能的危险因素，但足部姿势是否会导致异常的足部运动学尚不清楚。这是第一项研究，旨在在控制足部姿势的情况下，调查有和没有拇外翻的个体在步态中足部运动学的差异。
招募了 25 名患有拇外翻的女性和 25 名年龄在 18 至 22 岁之间的健康女性。使用标准化的舟骨高度截断和腿跟角测量足部姿势。通过三维运动捕捉系统记录步态中的足部运动学和动力学数据。为了在控制足部姿势的情况下研究患有拇外翻的个体的足部运动学特征，我们使用了倾向评分匹配方法。通过使用 1:1 最近邻程序和 0.2 的卡尺宽度获得匹配。
匹配了 12 对。与对照组相比，患有拇外翻的个体在站立阶段，中足背屈从 56%增加到 80%，后足外翻从 53%增加到 71%，前足外展从 5%增加到 29%。
患有拇外翻的个体的足部具有柔韧性，无法在步态中抑制后足和中足的动态变形。为了抑制拇外翻的发展，可能需要针对步态中后足和中足的动态变形的干预措施，而不管其静态足部姿势如何。
