Hi,
So I tore my patella about 8 years ago. Rehabbed fine, and was back to playing all the sports I've always played. About 6 months ago I played basketball and went home and noticed my knee was stiff and sore. I woke up the next day and my knee felt weak and I couldn't straighten my leg. For 3 days it was like this but by the 4th day it was back allowing me to bend it as normal but still felt weak but no pain. So then I tried to jump or sprint and it hurt, so I rested an stopped playing sports for 2 weeks. After the 2 weeks, I began doing simple exercises I learned when I rehabbed from the initial surgery. I did those workouts for another 2 weeks. Then after that I tried to jump and sprint again, and it was sore all over again. The next day I had trouble bending it again. So this has been going on for awhile now, where I try to jump or sprint, it hurts, I sit out a month or longer, try to jump and still have the same issues. I had an MRI, and went to my doc, and he doesn't see anything wrong in the MRI. So now i'm just confused as to what the issue could be and how can I fix it???