What Cause Pain In Shoulder Even After Debridement And Impingement Surgery?

Im a 34 yom whor recently had acrimoplasty on my left shoulder. The mri showed a moderate full thickness tear of 1.5cm long. however after surgery my dr said he found a small partial tear. Dureing surgery my doctor did debridement and impingement surgery im still going to physical therapy but the pain has yet to subside. range of motion is better. should I still be in pain and should i have another mri done? I had the surgery done on June 26 2011