Suprascapular Nerve Entrapment

Suprascapular nerve entrapment is compression or traction injury of the suprascapular nerve as it passes through the suprascapular or spinoglenoid notch. It can cause deep shoulder pain, rotator cuff weakness, and — when severe — visible muscle atrophy of the supraspinatus or infraspinatus. It is often misdiagnosed as rotator cuff disease.

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Typical Recovery Time

Variable; cyst-related cases often improve well with decompression

Symptoms

•Deep, aching posterior shoulder pain
•Weakness with shoulder abduction (supraspinatus) or external rotation (infraspinatus)
•Visible muscle wasting over the posterior shoulder
•Pain radiating to the neck or upper arm
•Symptoms worsened by repetitive overhead activity

Common Causes

•Ganglion cyst compressing the nerve at the spinoglenoid notch (common)
•Repetitive traction in overhead athletes (volleyball, baseball)
•Scapular fracture
•Direct trauma
•Iatrogenic from shoulder surgery

Treatment Options

1Nerve decompression via CT or ultrasound-guided cyst aspiration

2Physical therapy for periscapular strength

3Surgical cyst excision or nerve release for refractory cases

4Activity modification

5Electrodiagnostic testing (EMG/NCS) to confirm diagnosis

When to See a Doctor

See a provider if you have unexplained posterior shoulder weakness or visible muscle wasting — EMG and MRI can identify suprascapular nerve pathology.

Frequently Asked Questions

What is suprascapular nerve entrapment?

Suprascapular nerve entrapment occurs when a nerve supplying the shoulder becomes compressed or irritated. This can lead to pain and weakness. It is less common but important to recognize in athletes.

What causes suprascapular nerve entrapment?

It can be caused by repetitive overhead activity, cysts, or structural compression around the nerve. Throwing sports and weightlifting may increase the risk. Prior shoulder injuries can also contribute.

What are the symptoms?

Symptoms include deep shoulder pain, weakness, and sometimes muscle loss in the back of the shoulder. Pain may worsen with activity. Some patients notice decreased performance.

How is it treated?

Treatment often includes physical therapy and addressing the underlying cause of compression. Activity modification may be needed. In some cases, surgery is required to relieve pressure on the nerve.

When can I return to sports?

Return to sports depends on symptom improvement and strength recovery. Many athletes return gradually over weeks to months. Proper rehab is important to restore function.

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