I understand your concern regarding osteoarthritis which joint osteoarthritis you are having I am considering knee or hip as you have difficulty in walking these joints can be successfully replaced But before getting that done have your lupus controlled Controlling lupus might help you to feel better resulting in better sleep You may be having sleep trouble due to major joints arthritis Getting them replaced will relieve your pain please consult an orthopedic surgeon for explaining you about the surgery and pros and cons of surgery