<prompt> Hallux valgus is associated with all except -An exostosis on the medial side of the head of the first metatarsalA bunionOsteoarthritis of the metatarsophalangeal jointOver- riding or under- riding of the second toe by the third  <response>: Hallux valgus Hallux valgus is lateral outward deviation of great toe at the metatarsophalangeal joint.It is the commonest foot deformity.It is common in women past middle age and is not infrequent even in young women.Common causes are :Rheumatoid arthritisWearing pointed shoes with high heelsHereditary factorsIdiopathicPathologyOutward deviation of the great toe.Medially deviated head of the first metatarsal, causing an unduly wide gap between 1st 2nd metatarsal heads metatarsus primus varus.After several years two secondary changes occur:-Formation of a thick-walled bursa bunion over the medial prominence of 1 metatarsal head.Osteoarthritis of the metatarsophalangeal joint.It is worth noting that medial prominence over metatarsal head looks like an exostosis, but there is no true exostosis. Apleys 9the 603Lateral deviation of great toe causes overcrowding of lateral toes and sometimes overriding of adjacent toes. 