superficial probe of ultrasound was placed in the transverse plane to visualize the superior trunk in the short axis. The suprascapular nerve was identified as it branched off from the superior trunk and traced until it coursed beneath the inferior belly of the omohyoid muscle.

ultrasound-guided interscalene block involves imaging the C5 and C6 roots at approximately the level of the cricoid cartilage, just distal to where they emerge from behind their respective transverse processes and where they lie in the groove between the anterior and middle scalene muscles

The block needle was inserted in line with the probe in a lateral-to-medial orientation toward the suprascapular nerve. Local anesthetic solution was then injected after negative aspiration for blood to achieve circumferential spread around the neurovascular bundle

pain score from 0 to 10 which mean 0 no pain and 10 the worst pain ever

the time of first demand rescue analgesia

total fentanyl demand