Final answer:
A dorsal bunion is a foot deformity associated with a bump on the top side of the big toe's metatarsophalangeal joint, often caused by shoes with a narrow, pointed toe box like high heels. Unlike regular bunions which occur on the medial side of the foot, dorsal bunions are less common and indicate changes in the foot's anatomy.
Step-by-step explanation:
A dorsal bunion, also known as a 'hallux dorsalis,' is a foot deformity associated with a bony bump that occurs on the top side of the big toe's metatarsophalangeal joint. This condition differs from a regular bunion, which is a localized swelling on the medial side of the foot next to the first metatarsophalangeal joint. Dorsal bunions are less common than regular bunions and are a sign of changes in the foot's anatomy that may include joint inflammation or bone enlargement. Shoes with a narrow, pointed-toe box, like many high heels, can put excessive pressure on the toes and are most likely to cause this deformity. Furthermore, a regular bunion is often associated with osteoarthritis and can be a significant indicator of this condition. Comfortable footwear with a roomy toe box is often recommended to avoid such foot problems.