Pathophysiology
The suprascapular nerve can be injured in several places.
- The suprascapular notch. The nerve is apposed to the inferior margin of the superior transverse scapular ligament.
- Between the spine of the scapula and the tendinous margin of the infraspinatus and supraspinatus muscles during extreme abduction and external rotation of the shoulder.
- Compression at any point by a mass, most commonly a ganglion cyst.