Post Surgical Pain in Arthroscopic Shoulder

"In the PI group, a mixture of 30 ml bupivacaine 0.5% and 30 ml saline solution will be injected by the orthopedist after the wound is closed.~In the CSAB group, a total of 20 ml 0.5% bupivacaine, 10 ml to the suprascapular notch, 10 ml to the axillary nerve, will be administered preoperatively by the anesthesiologist under ultrasound guidance."