My knee felt funny now it hurts i just when straighting it pop like a gun shot and when bending the knee pain is almot unbearable?

Have it evaluated: Have it evaluated by a professional. Depending on the severity of the injury treatment options include: bracing, casting, physical therapy, injections, and surgical repair.

Arthritis.: You may have arthritis, particularly of the kneecap joint, which would account for the popping, when straightening the knee. See an orthopedic knee specialist for evaluation.