Relation between hallux valgus deformity and lumbar and lower extremity biomechanics.

Hallux valgus (HV) is a static subluxation of the first metatarsophalangeal joint with lateral deviation of the great toe and medial deviation of the first metatarsal. Our aim was to evaluate the interference of HV deformity with changes in lumbar lordosis and some foot deformities. Twenty HV patients and 20 healthy subjects were selected for the study. Hallux valgus angle, metatarsus primus varus (MPV), metatarsus omnis varus (MOV), first intermetatarsal (1.IMT), second metatarsal (2. MT) and hallux interphalangeal (HIP) angles were estimated from the anteroposterior foot X-rays. Lumbosacral (LSA) and sacrohorizontal angles (SHA) were measured from lateral lumbar x-rays and pes planus was detected from lateral and anteroposterior ankle and foot radiographs. There was a significant difference between HV angle mean values of two groups. MPV, MOV, 1.IMT, 2. MT and HIP angles did not show significant difference between groups. HV angle was found to be correlated with MPV. HIP angle was found to be correlated with LSA and SHA, indicating a relation with lordosis. HV and pes planus were correlated with each other. HV also showed weak correlation with hyperlordosis. Transmission of variations in body mechanics through pelvis and lower extremity plays an important role for certain foot deformities. Some factors affecting HV development are correctable; early diagnosis and treatment of MPV and pes planus, suggesting healthy rather than fashionable footwear and preventing obesity may lower HV incidence.