Oct 2017 I had bi-lateral Partial Knee Replacements. The left knee replacement failed as the bone on the bottom shifted. Nov 2018 I had revision surgery with Total Knee Replacement. Everything went well as 10 months later I was playing tennis again. 14 months Post Op, I was driving home (3 hr trip) and my left left (centered in the knee area) started to spasm and when I got out of the car I had problems moving the left leg. It felt like someone grabbed my knee and started to strangle it. I noticed that my knee started to swell and I had a big circular pocket of fluid on the outside of the knee as well. 12 days later and 1 or 2 episodes later I saw the PA at HSS (where I originally had the surgery) He drained the left knee and removed 60 cc of blood. I immediately felt a lot better. He told me it may fill with fluid again. Sure enough it has filled again and I have had another episode. I ice the knee all the time and try to keep it elevated. The spasms come and go randomly. Has anyone had anything like this happen to them and if so, what was the remedy. I have an appointment with the surgeon in 3 days and will be doing an MRI and MRA. I am totally frustrated and quite frankly paranoid to be alone at night.