Sorry about your luck Mike, had mine replaced four years ago and was riding my horse in two weeks. My oldest daughter and I went Elk hunting in the flat tops a month later and did a considerable amount of riding and walking.I realy haven't had much trouble, but I still do a hundred or so squats a couple times a week. Last week though I got clipped from behind by my male labrador, and shure found out it is not invincible. When you get the knee done, do the therapy. If you can stand it hook up with a therapist before the surgury and build those muscle up ahead of time.