I have been diagnosed with Osgood Schlatter disease and I’ve had it chronically for more than 10 years. My knees have always been turned inward. Last week, I hurt my knee/shin area playing soccer. What is the best course of action for these separate issues? Could they be related?

When I’m swimming free-style laps my lower back hurts. To counter, I use a float between my legs hence no exercise for the lower body. Is it simply a matter of possibly weak abs/obliques?