I am 36 years. I have pain in both knees from about 4 months. My uric acid test and xray is normal. I used tizanidine for one month by the advice of doctor but no result. I feel pain using stairs or sitting standing and now when come from cricket I feel very difficult to walk. When I wake up from sleep I feel my knees and below the knees legs are not move able. Please tell me my disease and medicine for it.