| Summary: | 碩士 === 國立體育大學 === 運動保健學系 === 103 === The principle of treating hallux valgus with foot orthotics was to correct hind foot eversion, which aimed at fixing overmuch pronation and then the valgus force of hallux. However, the therapeutic effect is still controversial. One of the possible reasons is that the effects of orthotics vary as a result of different ranges of the first ray mobility. This study aims to evaluate whether the hallux valgus patients have
different pressure relief influences on orthotics of adjusting hallux valgus. A total of 29 students (55 feet) from a sports university were selected as the subjects. The inclusion criteria were as follows: (1) over 20-year old; (2) mild/moderate hallux valgus; (3) no other disease affecting foot pressure except hallux valgus. The effects before and after giving hind foot medial wedge were compared to evaluate the relation between mean pressure change of the first metatarsal joint and first ray mobility when walking. It was found that after adding hind foot medial wedge, the first metatarsalphangeal joint pressure of 29 feet increased and 26 feet decreased; the first ray ventral mobility of those with increased pressure was more obvious than that of those with decreased pressure (9.4±6.0% and 6.1±4.7%, p=.03). The result was the same after excluding individual cases with foot pain when walking on shoes, but pressure change was not statistically related to the level of hallux valgus angle, foot arch height, hind foot valgus level and big toe dorsiflexion (p>.05). There were no difference in pressure change between hyper- and hypo- mobility according to three traditional classifications. The reason is that the traditional classifications all evaluated range of dorsal mobility. Therefore, it is recommended that the first ray ventral mobility should be taking into account when assessing hallux valgus orthotics in order to achieve optimal decompression results.
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