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[Suprascapular nerve entrapment at the spinoglenoid notch]
J L Henlin1, J P Rousselot, G Monnier
1Service de Neurologie, Hôpital Jean Minjoz, Besançon.
Revue Neurologique
|January 1, 1992
Summary
Suprascapular nerve entrapment in the spinoglenoid notch can cause infraspinatus muscle paralysis and shoulder pain. Electrodiagnosis is key, and surgical widening of the notch offers relief and potential recovery.
Area of Science:
- Orthopedic Surgery
- Neurology
- Sports Medicine
Background:
- The suprascapular nerve is vulnerable to entrapment at the spinoglenoid notch.
- Entrapment can lead to infraspinatus muscle paralysis and shoulder pain.
Observation:
- Seven cases of pure infraspinatus muscle paralysis were analyzed.
- Clinical and electromyographical findings revealed prolonged distal suprascapular nerve latencies in affected muscles.
- Mechanical factors, including synovial cysts, were implicated in five cases.
Findings:
- Electrodiagnosis confirmed significant delays in nerve signal transmission to the infraspinatus muscle.
- Surgical intervention involving spinoglenoid notch enlargement was performed on two patients.
- Post-operative outcomes showed rapid pain relief and some functional recovery of the infraspinatus muscle.
Implications:
- Early electrodiagnostic evaluation is crucial for diagnosing suprascapular nerve entrapment.
- Surgical decompression of the spinoglenoid notch is an effective treatment for associated infraspinatus paralysis.
- Understanding mechanical factors aids in managing this condition and improving patient outcomes.