I play basketball and had a torn left patella (~15%). I underwent surgery and nine and a half months of rehab to get it back to where it was before the injury. I feel better now and my knee is almost brand new (it took like three years though). Recently, I was training and doing some plyometrics - nothing new - and as I was coming down, I landing hard and my knee just shook. I felt pretty unstable after that. I kept my knee straight as I walked to sit down. When I sat, I bent my knee and my knee just... locked? I felt like some bone came out of socket and stick out of my skin. I flinched and extended my leg and it snapped back. It has happened every time since then when i bend my knee. The pain is EXCRUCIATING. My doctor is out of town until next Saturday and I only feel comfortable with him. I've tried almost every other orthopedic surgeon in my area and I am dissatisfied with their level of professionalism and helpfulness. I'm also traveling on Friday so I most probably won't be able to see my doctor. I'm pretty sure its not a patella related issue as my patella feels better than ever. I currently am wearing a brace I use to wear that keeps my leg at 180 degrees. Does anybody know what's going on, what I feel, how can I help the pain just until the next time I see a doctor. Please, ANYTHING is helpful. Any experiences? Thanks in advance for all the help.