I m asking for my 19 year old son in law. He played baseball regularly in high school, and noticed dull knee pain in the back of his knee after repeatedly sliding into base. It s plagued him for the last 6 months now. He has some trouble squatting and kneeling. He has no primary care physician, and insurance already covered a physical this year. (He did not report this pain at that time, although he did have it.) What would be the best course of action to diagnose this problem? (Should he see an orthopedic surgeon? Or an sports medicne PT? What direction should he look in?) Thank you!