A deformity where the big toe angles inward toward the second toe.
Hallux valgus is a progressive deformity of the first metatarsophalangeal joint characterised by lateral deviation of the hallux and medial deviation of the first metatarsal, often producing a visible 'bunion' at the joint margin. Aetiology is multifactorial, with footwear, genetic predisposition, foot biomechanics, and sex all implicated, though the relative contribution of each remains debated. Severity is typically graded radiographically via the hallux valgus angle and intermetatarsal angle, and the deformity can affect gait, balance, and load distribution across the forefoot.
This definition was auto-drafted and is pending editorial review.