After more than a year of cortisone shots and one arthroscopy, doc has suggested a knee Synevectomy. What is the recovery time? I am an active, healthy 62 year old. Or I should specify I WAS active. Doc has been draining 60 cc's of fluid from my knee weekly. He's done extensive bloodwork which is negative. Fluid contains 18,000 white blood cells at last aspiration. Any advice out there?