ABSTRACT
The deformity of hallux valgus (HV) consists of lateral deviation of the big toe at the first metatarsophalangeal (MTP) joint with medial deviation of the first metatarsal. There is resultant prominence of the bone and soft tissues on the medial side of the first metatarsal head. The first MTP joint may be subluxated or dislocated: there may also be changes at the cuneiform-metatarsal joint. A hallux valgus angle (HVA) greater than 15° and an intermetatarsal angle (IMTA) of more than 9° are abnormal. Pronation of the big toe may occur when the HVA exceeds 30°.
