The inferior transverse scapular ligament (spinoglenoid ligament) bridges the spinoglenoid notch between the scapular spine and the posterior glenoid margin, creating a fibro-osseous tunnel through which the suprascapular nerve passes to reach the infraspinatus.
Creates the fibro-osseous tunnel for the suprascapular nerve at the spinoglenoid notch, separating the infraspinatus branch of the suprascapular nerve from the supraspinatus branch that passed through the superior notch.
Spinoglenoid notch ganglion cysts (commonly arising from posterior labral tears) compress the suprascapular nerve at this ligament level, producing selective infraspinatus denervation without supraspinatus involvement. Arthroscopic cyst decompression and posterior labral repair relieves the nerve compression.
Labral tear-related ganglion compressing the suprascapular nerve at the spinoglenoid ligament producing selective infraspinatus denervation and posterior shoulder weakness, managed by arthroscopic cyst decompression and labral repair.
Infraspinatus atrophy without supraspinatus involvement identifying the compression level at the spinoglenoid ligament rather than the transverse scapular ligament.
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