Interphalangeal Joints of Foot (Left)

Description

The interphalangeal joints of the foot are the joints formed between the articular surfaces of the phalanges. The proximal interphalangeal joints are formed between the heads of the proximal phalanges and the bases of the middle phalanges. The distal interphalangeal joints are formed between the heads of the middle phalanges and the bases of the distal phalanges. The great toe only has one interphalangeal joint, since it only has a proximal and distal phalanx.

The interphalangeal joints are synovial hinge joints which allow movements such as flexion and extension. The heads of the phalanges have a trochlear shape, while the bases have a curved double concavity receiving surface. The joints are enclosed by a fibrous capsule, lined with a synovial membrane. The capsule is reinforced laterally and medially by the collateral ligaments, on its plantar aspect by the plantar ligaments, and dorsally by the extensor expansion.