he central nervous sys tem uses a dynamic combination of sensory inputs from the vestibular, somatosensory, and visual svstem to control balance. Information from all three sensory systems, although somewhat redundant, enables the central nervous system's recognition and control of the body's orientation in space, relative orientation of body segments, and relative interaction of body center of gravity and center of pressure (16). The central nervous system varies the weight assigned to each sensory input according to initial conditions of the individual and the environment. The goal is central nervous system balance control to maintain upright stance (1,121.When acuity of one sensory system decreases due to disease or trauma, the other sensory systems adjust so the central nervous system receives sufficient information to make appropriate motor responses to maintain balance (16). The degree of compensation by the other sensory systems is dependent upon many factors, including the individual's capability for learning.The present study evaluates one of the sensory system's contributions to balance abilities, proprioception. Ankle injuries are common in sports