Well, the "subject" says it all. When is it right to consider joint replacement?? I still get around, but going down stairs is pretty dicey. Occasionally, when walking, a knee "buckles" (haven't fallen yet). Fairly frequent brief, very sharp pain in knees. Knee & hip pain when I've walked a short distance, but can keep going if I slow way down. Do I wait as replacement techniques improve, but I get older so heal more slowly (now 75)?