Can you please define hallux valgus deformity?

Bunion: It is a bony prominence on the inside of the foot at the big toe. It is a misalignment which causes the big toe to become angled toward the little toes - where the term hallux valgus comes from. It can create pain in shoes, problems with foot function and can be treated by conservative and surgical means. Not all bunions are the same. See a podiatrist and have your foot examined properly.

Bunion deformity: A bunion deformity with an external rotation of the big toe.

It is defined by radiology as greater than or equal to 15 degree angle between the 1st metatarsal and the great toe (AKA hallux). The hallux (1st toe) deviate ls towards the lesser toes. The angle is only valid when calculated on radiographs that are WEIGHTBEARING. Clinically, the person will have a bunion deformity (prominence at the medial side of the foot).