What is the cause of my knee pain?

Different causes: Pain in the knee can be caused by a number of problems, including patellar chondromalacia, torn meniscal cartilage, arthritis or a loose body in the knee. An orthopaedic consult may be necessary to assist in evaluation and treatment.

Many possibilities: Could be simply instability, but could also be arthritis, tendonitis or even fracture. Rheumatology or orthopedic evaluation required.