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Foramen Scapulae – Anatomy and Clinical Relevance
The foramen scapulae is a bony opening on the superior border of the scapula through which the suprascapular nerve passes. It is clinically relevant in shoulder nerve entrapment syndromes.
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The foramen scapulae is a bony opening on the superior border of the scapula through which the suprascapular nerve passes. It is clinically relevant in shoulder nerve entrapment syndromes.
Definition and Anatomy
The foramen scapulae (also known as the suprascapular notch or incisura scapulae) is a bony indentation or opening located on the superior border of the scapula (shoulder blade), just medial to the coracoid process. This notch is converted into a foramen (enclosed opening) by the superior transverse scapular ligament (ligamentum transversum scapulae superius), which bridges across it. The suprascapular nerve passes through this foramen, while the suprascapular artery typically runs above the ligament.
The shape and size of the foramen scapulae vary considerably between individuals. In some people, the overlying ligament may become ossified (calcified), significantly narrowing the passage and increasing the risk of nerve compression.
Clinical Relevance
The foramen scapulae is most clinically significant in the context of suprascapular nerve entrapment syndrome, where the suprascapular nerve becomes compressed at this anatomical bottleneck, leading to characteristic shoulder symptoms.
Causes of Nerve Compression
- Thickening or ossification of the superior transverse scapular ligament
- Ganglion cysts or other space-occupying lesions near the foramen
- Traumatic injuries to the shoulder region
- Chronic overuse, particularly in overhead athletes (e.g., volleyball, swimming, baseball)
- Anatomical variants with a narrowed foramen
Symptoms of Nerve Compression
Compression of the suprascapular nerve at the foramen scapulae can produce the following symptoms:
- Deep, dull shoulder pain that is often difficult to localize precisely
- Weakness in arm abduction and external rotation of the shoulder
- Atrophy (muscle wasting) of the supraspinatus and/or infraspinatus muscles
- Functional limitations of the shoulder joint
Diagnosis
Diagnosis of suprascapular nerve entrapment at the foramen scapulae typically involves a combination of clinical assessment and imaging:
- Clinical examination: Muscle strength testing and provocative maneuvers of the shoulder
- Electromyography (EMG) and nerve conduction studies (NCS): Detection of nerve damage or delayed conduction
- MRI (Magnetic Resonance Imaging): Visualization of ganglion cysts, muscle atrophy, or anatomical anomalies
- X-ray / CT scan: Assessment of bony structures and potential ligament ossification
Treatment
Treatment is guided by the underlying cause and the severity of nerve involvement:
Conservative Treatment
- Physical therapy to strengthen shoulder musculature and restore range of motion
- Activity modification to reduce repetitive overhead stress
- Non-steroidal anti-inflammatory drugs (NSAIDs) for pain relief
- Corticosteroid injections to reduce local inflammation
Surgical Treatment
- Arthroscopic or open decompression: release of the superior transverse scapular ligament to enlarge the foramen
- Excision of ganglion cysts or other compressive lesions
With timely intervention, the prognosis is generally favorable. Muscle atrophy that has already developed may partially or fully resolve following successful decompression.
References
- Plancher KD, Peterson RK, Johnston JC, Luke TA. The spinoglenoid ligament. Anatomy, morphology, and histological findings. J Bone Joint Surg Am. 2005;87(2):361-5.
- Boykin RE, Friedman DJ, Higgins LD, Warner JJ. Suprascapular neuropathy. J Bone Joint Surg Am. 2010;92(13):2348-64.
- Standring S (ed.). Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd edition. Elsevier, 2021.
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