Objective: to assist balance and posture disturbances secondary to proprioceptive impairment in patients with knee osteoarthritis compared to an age-matched control group of normal healthy subjects.Methods: proprioception impairment, balance control and functional status were assessed in 25 patients with knee osteoarthritis and 15 age-matched healthy control subjects using the computerized dynamic posturograghy device and correlating there obtained results with the functional, radiological and clinical assessment.Results: compared with age-matched controls, subjects with symptomatic knee osteoarthritis have reduced knee proprioception and increased postural sway. This was associated with reduced functional performance of the patients, including mobility, transfer and activities of daily living. Also we have shown an age-related decline in proprioception as have others by different methods.Conclusion:The prospect that knee OA is associated with proprioception impairment and functional disability has important implications for the care of patients with this disease. The rehabilitation strategies for these patients should include specific training programs to improve proprioception and reduce falls. This may improve the functional performance of OA patients and alleviate the personal and socioeconomic burden of this disabling condition.