Extrinsic foot muscle forces and joint contact forces in flexible flatfoot adult with foot orthosis: A parametric study of tibialis posterior muscle weakness

Abstract Background The posterior tibialis tendon dysfunction (PTTD) is typically associated with progressive flatfoot deformity, which could be alleviated foot orthosis. However, the evaluation of (TP) weakness on lower limb mechanics adults orthoses scarce and requires further investigation. Research question This study aimed to examine effects TP in orthosis through gait analysis musculoskeletal modelling. Methods Fifteen young were recruited from University perform a experiment without orthoses. Data collected motion capture system used drive modelling for estimation joint force extrinsic muscle forces limb. A parametric was conducted by adjusting strength 40 % 100 %. Two-way repeated measures ANOVA compare peak among different levels insole conditions. Results significantly increased ankle superoinferiorly (F = 125.9, p Significance (flexor hallucis longus flexor digitorum longus) condition indicated that may induce compensatory activation attenuated load. abnormal might restored