Last night I started working out for the first time in awhile (quick 2 mile jog on the treadmill). I started out slow with a fast walk and eventually started jogging. When I started jogging, however, I felt a sharp pain in my knee but continued because it wasn’t too bad. I was unable to hear a pop due to my headphones being on.

After finishing my run, I felt fine. The next morning, I was unable to bend/straighten my knee or walk properly. My knee looks swollen, and my other one feels fine. I’m not sure if it’s just a strain or a tear but I really can’t walk, what could be the problem?