[Suprascapular nerve entrapment at the spinoglenoid notch].
The suprascapular nerve passes through the spinoglenoid notch with a risk of entrapment. This results in distal nerve lesion characterized by isolated paralysis of the infraspinatus muscle and, most often, by shoulder pain. We report 7 clinical and electromyographical cases of pure infraspinatus muscle paralysis. The value of the electrodiagnosis, which demonstrated prolonged suprascapular distal nerve latencies (over 5 milliseconds) in the infraspinatus muscle affected while latencies were normal in the supraspinatus muscle, is emphasized. Mechanical factors were associated with paralysis in 5 cases. Compressive synovial cysts were found in 2 patients operated upon. Surgical enlargement of the spinoglenoid notch regularly and rapidly relieves pain and sometimes helps in recovery of the infraspinatus muscle.
Henlin
J L
JL
Service de Neurologie, Hôpital Jean Minjoz, Besançon.
Rousselot
J P
JP
Monnier
G
G
Sevrin
P
P
Bady
B
B
D000293:Adolescent; D000328:Adult; D001917:Brachial Plexus; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009123:Muscle Hypotonia / Q000209:etiology; D009408:Nerve Compression Syndromes / Q000150:complications / Q000175:diagnosis / Q000209:etiology*; D010146:Pain / Q000209:etiology; D010243:Paralysis / Q000209:etiology; D012540:Scapula / Q000294:innervation*; D013581:Synovial Cyst / Q000150:complications
Syndrome canalaire du nerf sus-scapulaire dans le défilé spino-glénoïdien.