What kind of doctor should I see about fluid on my bursa?

I went to my family practice physician who was certain that I had torn a ligament in my rotator cuff (not sure if I'm using the right terminology since this was 4 months ago now) and ordered an MRI. The MRI revealed a few things but my doctor determined the main problem to be the fluid on the bursa. He ordered physical therapy, but I already had it treated that way before and the pain just kept returning. Everyone that I've talked to with this problem said that it needs to be drained (which is obvious). Just curious as to what kind of specialist I should look to make an appointment with.