I tore my ACL almost three years ago, and had reconstruction surgery two and a half years ago. I finished physical therapy and am fully recovered. However, last night at a flag football game, while messing around on the side lines, my knee gave out to the side. Since then it's been extremely sensitive to side-to-side movement and when I woke up this morning, it was very sore. I didn't hear anything pop, so I don't know if I have torn it again, but I know that something is wrong.
Can anyone help me out, should I be worried?