I get a painful knot behind my knee that goes away with rest. It happens when I have been doing a lot of squatting on my job. Eventually, it cramps my leg up, starting in my calf and radiating up to my groin. Resting for a few minutes causes the knot and pain to dissipate. My doctor suggested therapy. The therapist said nothing was wrong with my knees. I do have Osterioporis and Degenerative back disease along with sciatic nerve pain. This is not radiating down my leg but starts in the calf and radiates upward. I've been doing therapy with improvement. However, after a strenuous day at work, I developed severe sharp pain in my calf. I couldn't bend my knee without shooting pain. The knot did not appear and hasn't. I asked my doctor if my knee was fine what could be causing the painful lump behind my knee. His conclusion was a possible Bakers cyst. Could the cyst have ruptured causing the shooting pain?