The suprascapular nerve provides articular branches to the acromioclavicular joint capsule as it passes beneath the suprascapular ligament, in addition to its well-known branches to the glenohumeral joint and rotator cuff. These AC joint branches are the primary sensory innervation to the superior AC joint capsule.
The suprascapular nerve articular branch to the AC joint is targeted in AC joint denervation procedures for chronic AC joint arthritis pain. Ultrasound-guided suprascapular nerve block anaesthetises both the glenohumeral and AC joint articular branches simultaneously. Suprascapular neuropathy may present with AC joint pain in addition to the classic posterior shoulder and supraspinatus fossa pain.
Sensitisation of suprascapular articular branches at the AC joint in chronic AC joint arthritis, producing superior shoulder pain that responds to suprascapular nerve block at the notch.
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