The first metatarsocuneiform joint, hypermobility, and hallux valgus: what does it all mean?

The etiology and treatment of the hallux valgus deformity has long been a subject of controversy. Early reports focused on increased first metatarsocuneiform joint mobility as the primary cause of the deformity. While this theory was widely accepted, little evidence was offered in its support. Recent reports have provided objective evidence calling into question the notion of hypermobility. While flexibility in the first metatarsocuneiform joint is necessary for hallux valgus to develop, increased mobility is the result rather than the cause of the deformity.