Have MG, aortic regurgitation AR, and treated high blood pressure. Age is 79, weight about normal, now both knees are shot. Have had the xrays, and Dr. says cartilage is gone in both knees. Took the steroid shots but both have worn off in less than two months. Question, would it be wise to go ahead with surgery, and how much is the risk increased? I m sure I won t like the answer. Thanks!