Boutonniere deformity is caused by a disruption of the extensor tendon at the middle phalanx, leading to flexion of the proximal interphalangeal joint and hyperextension of the distal interphalangeal joint.

Boutonniere deformity involves a finger joint abnormality, while wearing high heels can cause foot deformities such as bunions and hammertoes, due to narrow, pointed toe boxes applying pressure and causing bone enlargement or inflammation.

Explanation:

A boutonniere deformity is a deformity in which the middle joint of the finger is bent downward while the outermost joint bends back. While the specific question refers to high heels leading to foot deformities, such as bunions and hammertoes. Like boutonniere deformity, bunions and hammertoes are skeletal system disorders causing alterations in normal anatomy. Wearing high heels that have a narrow, pointed toe box can contribute to the development of a bunion, which is a protrusion at the base of the big toe.

The pressure from the shoes on the side of the foot leads to the enlargement of bone or inflammation of tissues, pushing the big toe towards the other toes, and potentially creating other deformities like hammertoes. This is important information for understanding how footwear can significantly influence foot health and skeletal alignment.