Spinoglenoid paralabral cyst causing isolated infraspinatus weakness: importance of precise localization and arthroscopic management – a case report
Nihar Modi, Jonathan HeraldBackground:
Spinoglenoid paralabral cysts are a rare cause of suprascapular nerve compression and often present with subtle motor deficits, leading to delayed diagnosis.
Case presentation:
A 48-year-old manual laborer presented with progressive shoulder fatigue without significant pain. Examination showed isolated infraspinatus weakness and hypotrophy with preserved range of motion. MRI revealed a spinoglenoid cyst with a posterior labral tear, and electroneuromyography confirmed suprascapular nerve involvement. Arthroscopic cyst decompression with posterior labral repair was performed. Follow-up imaging showed cyst resolution, electroneuromyography demonstrated reinnervation, and infraspinatus strength and muscle bulk were restored to near-normal.
Clinical discussion:
Accurate localization of suprascapular nerve compression requires correlation of clinical findings with MRI and electromyoneurography. Although it is commonly described in overhead athletes, occupational overhead activity may produce similar biomechanical stress. Arthroscopic decompression with labral repair provides effective treatment and promotes nerve recovery.
Conclusion:
Suprascapular neuropathy from spinoglenoid cysts should be considered even in non-athletes, and timely diagnosis and treatment can restore function.