Something is wrong with my tendon under my knee cap?
Every year or so sometimes once every 3 years the tendon behind my left knee shifts left and I cannot straiten my leg. It hurts really bad. If I try to straiten my leg it seems like the tendon is stretching way to much and it's honestly the worst pain I have experienced. How i fix it is I move my leg slowly left or right and it pops back where the tendon normally is and the pain is gone almost right away. I was just wondering why it does this and how I can fix this permanently. It's honestly the worst pain.