Quadrilateral Space Syndrome (QSS) is a relatively rare condition characterized by the compression of the axillary nerve and/or the posterior circumflex humeral artery (PCHA) as they pass through a confined anatomical area in the shoulder called the “quadrilateral space.” This space is bordered by:-
The compression in the quadrilateral space can be caused by various factors, often leading to a reduction in the space available for the nerve and artery. Common causes include:-
Anatomical Variations: Some individuals may have a naturally smaller quadrilateral space or variations in nerve/vessel branching that predispose them to compression.
The symptoms of QSS arise from the compression of the axillary nerve and/or the posterior circumflex humeral artery. They can be vague and often mimic other shoulder conditions, making diagnosis challenging.
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