I have scarring in both quadriceps which causes contractures in both knees and limits my ROM to 90 degrees in my TKA knee (pre-op) and 40 or so in my non-operative knee. I'm at 40 degrees or so in the affected knee as well. So I have limited mobility and stability in both knees and they buckle sometimes. The Dr I saw yesterday took x-rays and said that the implant was okay but thought the patella was possibly too high. He also thought that the quadriceps tendon and the patella tendon repair might be allowing the patella to move unnaturally and be the cause of my chronic pain. He also ordered an MRI which is more than my original surgeon did. I'm not sure what can be done to fix it if that is the issue but at least I will know the cause and not just the symptom.