Suprascapular Nerve Block: Chosen for What It Avoids

The suprascapular nerve carries around 70% of the sensory supply to the shoulder joint, which is what makes blocking it attractive in a joint that is otherwise difficult to anaesthetise without producing arm weakness. It is used for chronic shoulder pain, adhesive capsulitis, and as an analgesic technique around shoulder surgery.

Its real advantage is not that it works better than the alternatives. It is that it avoids the complications the alternatives cause. This reference sets out the anatomy, the evidence in chronic and perioperative use, and the specific safety trade that makes this block worth knowing. It sits under our clinical reference to nerve blocks in outpatient pain practice.

The nerve and the notch

The suprascapular nerve arises from the upper trunk of the brachial plexus, runs beneath the trapezius toward the suprascapular notch, and passes under the transverse scapular ligament into the supraspinous fossa. It supplies the supraspinatus and infraspinatus muscles and sends articular branches to the glenohumeral joint and the acromioclavicular joint.

Two target zones are used. The classical approach places the injectate at or near the suprascapular notch. The more modern ultrasound-guided approach targets the nerve in the suprascapular (floor of the supraspinous) fossa, away from the notch and therefore away from the suprascapular artery and the route to the pleura.

Because the nerve is motor as well as sensory, a block placed proximally can produce weakness of external rotation and abduction. That is expected rather than harmful, but a patient who has not been warned will interpret it as injury.

Where the evidence is clearest

The strongest data sit in shoulder arthroscopy, and they make an argument about safety rather than potency.

A 2026 network meta-analysis of 25 randomised trials in 2,039 patients compared ten block techniques after arthroscopic shoulder surgery. Combined suprascapular and axillary nerve block ranked best for pain at six and twenty-four hours, and upper trunk block reduced 24-hour morphine consumption most, followed by suprascapular block.

The complication profile is where suprascapular block separates decisively from the interscalene approach it often replaces:

• Hemidiaphragmatic paralysis — lowest with infraclavicular-suprascapular block at 0%, against 29.5% for supraclavicular brachial plexus block.
• Hoarseness — 0% for both infraclavicular-suprascapular and suprascapular block.
• Horner syndrome — 0% for both, against 5.7% for upper trunk block.
• Motor block — lowest of all techniques with suprascapular block, at 1.2%.

For a patient with respiratory limitation, in whom phrenic palsy from an interscalene block is a genuine risk rather than a theoretical one, that table is the whole argument.

Chronic shoulder pain

Here the evidence is weaker and the honest position is more restrained.

The pillar reference records suprascapular nerve block as producing large reported effects in frozen shoulder and chronic shoulder pain while sitting at Therapeutic Level III only. Nothing in the recent literature overturns that.

A 2026 systematic review of pulsed and cooled radiofrequency for chronic shoulder pain — ten studies, 476 participants — is instructive about the wider field. Four randomised trials comparing pulsed radiofrequency against corticosteroid-based injection or active nerve block found that pulsed radiofrequency improved pain and function but did not demonstrate superiority over corticosteroid-based treatment, which generally gave greater short-term relief. Certainty of evidence was rated low, and very low for cooled radiofrequency, which had no controlled comparative studies at all.

Read across, the picture for the chronically painful shoulder is that several interventions produce improvement, none has established superiority, and the corticosteroid injection that the newer techniques are meant to replace is still performing respectably. Where steroid is used, the cumulative-exposure discipline in corticosteroid injections applies.

Safety

The suprascapular notch sits above the supraspinous fossa and the pleural dome is not far below, which is why pneumothorax is the complication that defines this block when it is performed blind or with a needle angled medially. The fossa-based ultrasound approach exists largely to remove that risk by keeping the needle over bone.

The suprascapular artery accompanies the nerve at the notch, so vascular puncture and intravascular injection are the other technical concerns. The general safety architecture — local anaesthetic systemic toxicity, asepsis, and the anticoagulation guidance that differs between societies — is set out in the nerve blocks reference.

For clinicians

This is a block where the choice of target zone changes the risk, and recognising the floor of the supraspinous fossa on a live scan is the skill that makes it safe. This reference carries no needle depths or trajectories for that reason. What guidance actually improves — accuracy and safety rather than pain scores — is covered in musculoskeletal ultrasound for pain practice.

Empire teaches the suprascapular nerve block under ultrasound guidance within Advanced Musculoskeletal Ultrasound Guided Injections, alongside the other peripheral blocks in the pain management academy.