Chronic knee pain exacerbated by exercise, crepitus, pain increases when walking down stairs, a feeling of something catching when walking down hill?

See an orthopedic Dr. I would see an orthopedic Dr. and get an accurate assessment on the condition of both your knees.
Osteoarthritis. You have knee osteoarthritis and possible meniscal and ligaments damage. Need to have x-rays and possible MRI. There are some new treatments with intra-articular HGH, PRP.