I had first LTKR 3/19. My recovery was slow to non-existent. To keep this short, went for a second opinion to two doctors. Implant checked by 3 surgeons, found to be in solid. Found a revisionist surgeon who was positive my pain was due to unstable knee due to thin spacer. Revision surgery was 11/19. Knee felt good, recovering well EXCEPT I still had this rolling tendon feeling in outer side of knee. It felt like when I took a step a tendon or ligament slid across the side of the knee. Fast forward to 9 weeks PO, I was getting out of the car and my knee kind of popped on the lower left side where it felt like a breadstick breaking. Since then my knee is becoming slightly unstable again (OS today noticed it) I have targeted pain where pop occurred. I have had days I couldn't put weight on that spot, then after rest it would be okay. Doc seems to think everything is fine and I should just keep exercising. At almost 12 weeks I think he's full of it. Pain has increased a LOT since that pop. I should not be in this kind of pain at this point.