Shoulder pathology

Question 1

What is the quadrilateral or quadrangular space

Answer 1

Clinically important space in the posterior arm: axillary nerve and posterior circumflex humeral artery can be compressed due to space occupying lessions or trauma

Question 2

Boundaries of the space: superior, Inferior, medial border, lateral border

Answer 2

Superior: Teres Minor, Inferior: Teses Major, Medial border: Long head of triceps Lateral Border: Surgical neck of the humerus

Question 3

What is sub-chondral bone erosion

Answer 3

A confirmed focal bone loss extending below the hyaline cartilage, and cortical bone. Joint space narrowing minimal but uniform. No osteophyte formation

Question 4

What is a Hill-Sachs Fracture or lesion

Answer 4

Associated with anterior glenohumeral dislocation. Presents as a wedge-shaped depression of the humeral dome at the level of the infraspinatus