My doctor said that I am having grease problem in my knee and I am only 21 years old. The solution of this is to inject supplement in my knee which is applicable for 2 years only. Please tell me the reason, cause and another treatment of this problem (if any). Tell me about this supplement and the whole procedure. My test reports are normal like vitamin D test, rheumatoid arthritis (negative), thyroid (normal) and uric acid, blood report but in the tomorrow xray's report (skyline view) my right knee compressed and left knee normal.