A radiographic study of the relationship between metatarsus adductus and hallux valgus

The relationship between metatarsus adductus and hallux valgus was evaluated on 100 dorsoplantar weight-bearing radiographs. The metatarsus adductus angle varied positively with the degree of hallux valgus. By using measures of correlation, a significant linear association was found for women (r = .53, P < .001) and men (r = .48, P < .001). The relationship was strongest in women when all cases of abnormal metatarsus adductus (>24°) were associated with abnormal degrees of hallux valgus (>15°). This relationship was different in men in that abnormal metatarsus adductus angles were not always associated with abnormal hallux valgus angles. With male and female data combined, the prevalence of metatarsus adductus was 55% in subjects with hallux valgus deformity compared with 19% in subjects without hallux valgus. A X2 test showed this to be a significant difference in the distribution of the data (P = .002). The data of this study suggests that there may be a clinical association between metatarsus adductus and hallux valgus. The need to further evaluate the role of metatarsus adductus angle in hallux valgus surgery is emphasized.