Best advice for permanently hurt knee? (Calcified Hematoma)?

I have a calcified hematoma (calcium build up by joint of knee) on my right knee....I've had it for over a year now. It was caused from knee damage in volleyball. Only a teen and play school and club volleyball year round. It seems every season since then i will land on it wrong or whatever and it will swell, bruise, and hurt like no other. I want to avoid this for this upcoming season. Sometimes my knee will lock up and not let me maneuver it. I've gone threw xrays, physical therapy, and lots of doctors appts. Physical therapy only worked for a little while. Any other suggestions? Yes i knwo surgery is an option, but would like to avoid it. I am already aware that the hematoma will be on my knee for the rest of my life.