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Quadrangular Space


- See: Trianglular Space

- Anatomy:
    - formed by:
           - humerus
           - teres major
           - teres minor
           - long head of triceps
    - contents:
           - axillary nerve & posterior humeral circumflex artery pass posteriorly thru the quadrangular space;

- Quadrilateral Space Syndrome:
    - caused transient blockage of the posterior humeral circumflex artery (and axillary nerve);
    - typically occurs when the arm lies in a position of abduction, extension, and external rotation;
    - patients note shoulder pain and paresthesias down the arm, esp with overhead activity;
    - MRI findings may include atropy of the teres minor muscle as seen on saggital oblique MRI views

Quadrilateral Space Syndrome: Diagnosis and Operative Decompression Technique

Quadrilateral space syndrome

Surgical Decompression of the Quadrilateral Space in Overhead Athletes

Quadrilateral Space Syndrome: Incidence of Imaging Findings in a Population Referred for MRI of the Shoulder