Interphalangeal joint of the foot

The interphalangeal joints of the foot are the articulations between adjacent phalanges . Each foot has nine interphalangeal joints. The hallux has one interphalangeal joint whilst the lesser digits each have a proximal and a distal interphalangeal joint.

Gross anatomy

The joint is formed by the articulation between the head of a phalanx with the base of the phalanx located distally . The joint is stabilized by a pair of collateral ligaments and an articular capsule . The joint is a hinge joint and allows for flexion and extension of the phalanges .

Related pathology

Erosions of the margins of the interphalangeal joint of the hallux and distal interphalangeal joint of the lesser digits can occur in psoriatic arthritis . In rheumatoid arthritis, erosions of the medial aspect of the interphalangeal joint of the hallux is a common finding .