So I've had this injury for about a year or more. What happen was during a 100 mile ride, both knees started to ache. I misinterpreted the aching and keep going. Once i finish and started to cool down, I couldn't bend my knees with out intense pain. How it felt was like i was trying to rotate an old knob. This went on for about 3 days and stayed in bed for most of the time, due to not having insurance at the time i couldn't see a doctor. Now a year later I'm trying to go back to cycling, but at times i feel the same pain as before but not as intense coming back. What may be the problem and is it fixable to continue cycling?