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A hinge joint is a type of synovial joint that exists in the body and serves to allow motion primarily in one plane.[1] The hinge joint is made up of two or more bones with articular surfaces that are covered by hyaline cartilage and lubricated by synovial fluid.[2] Stabilization of each hinge joint is by muscles, ligaments, and other connective tissues, such as the joint capsule.[3][4] The hinge joints of the body include the elbow, knee, interphalangeal (IP) joints of the hand and foot and the tibiotalar joint of the ankle.