HP_0001371 (Flexion contracture) can be described as follows. A flexion contracture is a bent (flexed) joint that cannot be straightened actively or passively. It is thus a chronic loss of joint motion due to structural changes in muscle, tendons, ligaments, or skin that prevents normal movement of joints. Also known as: Flexed joint that cannot be straightened, Flexion contractures, Flexion contractures of joints.