Hello, I fell about 10 days ago, and thought I had just bruised my knee. I was still able to walk, and had no real pain. However, now the bruises are fading and I have noticed that there feels like the knee is pinching, and I can feel an abnormal gap on the top of the my knee... it feels like about a 1/10 of an inch crevice that runs across the top of the knee. Any ideas?