Hi, Noted the history of plan for left knee replacement, left hip bursitis, taking treatment for the same in the form of exercises, take anti-inflammatory and so on. Usually the opposite hip joint is more affected when the knee is also affected. Hence there may be a specific cause of left hip bursitis. I would advise you the following: Consult your Orthopedic Surgeon for examination of both joints. MRI of the left hip joint. This will give a proper diagnosis so that an appropriate management can be done. Sometimes biopsy of the bursa gives a specific cause like tuberculosis and so on. Some cases are well treated with medications and some need a corrective management. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. T Chandrakant, ENT & General Surgeon