The interphalangeal joint is a type of joint found in the fingers and toes, connecting the phalanges, or bone segments. These joints allow for bending and straightening movements, which are essential for gripping and walking. There are two types of interphalangeal joints in each finger: the proximal interphalangeal joint (PIP) and the distal interphalangeal joint (DIP). Each interphalangeal joint is classified as a hinge joint, meaning it primarily allows movement in one direction. The structure of these joints includes cartilage, ligaments, and synovial fluid, which help reduce friction and provide stability. Proper function of the interphalangeal joints is crucial for everyday activities involving the hands and feet.