I have major pain in my medial knee with mult injections over the years, but no pain in my pf area. X-rays show oa in the pf. Am I a pkr candidate?

Uni knee. Medial knee pain with no pf pain, good varus/valgus alignment, no ligamentous instability would make you a uni candidate. Of course, pf joint would not be addressed, and you might be looking at tka conversion down the road.