Abstract: A device which is designed for use by athletes to protect against and prevent injury to the knees, lower extremities, ankles and feet, without restricting mobility or efficiency. The apparatus includes a dynamic system of components which are worn by the athlete during the athletic event and, in a preferred embodiment, includes elastic, corset-like tights or leggings which have secured thereto at least one pair of cable assemblies, one for each leg, which extend from the hip area to the foot area. Each cable assembly includes a flexible, non-elastic cable which is wrapped about the leg at least one full turn between the hip and the foot. Means are provided for securing the lower end of the cable to the athletic shoe of the wearer, and means are also provided for tensioning the cable to any desired degree. The tensioned cable assemblies protect the limb complex unit from angular and torsional stresses incurred during the athletic event.