Upper Extremities
22 Scapula
Anatomy
Scapula: coracoid process, acromion, glenoid cavity, scapular notch, lateral angle, superior angle, body or wing or ala, inferior angle, superior border, medial or vertebral border, lateral or axillary border, supraspinous fossa, infraspinous fossa, subscapular fossa, crest of the scapular spine, dorsal or posterior surface, anterior or costal surface
Projections
[Part], PA or AP
CR Location
[Part], PA or AP –
Evaluation Criteria
AP Scapula Image Criteria: Lateral portion of the scapula should be seen without superimposition of the ribs (indicating correct abduction of arm).
Lateral Scapula Image Criteria: Body of scapula is seen in lateral profile, free of superimposition of ribs. Humerus should not superimpose the area of interest.
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Hows & Whys of Scapula Radiography
- What level is the lower margin of the scapula located at?
- T7
- What level is the upper margin of the scapula located at?
- T2
- What is the medical term for armpit?
- Axilla
- What purpose do the supraspinous and infraspinous fossae serve?
- They are the site of attachment of the shoulder muscles.
- What does abduction of the arm do?
- It pulls the scapula laterally to clear more of the thoracic structures.
- What structures are best visualized by the lateral scapula with the arm placed behind the back?
- Acromion and Coracoid processes
- What structure is best demonstrated by the lateral scapula with the patient grasping the opposite shoulder?
- The body of the scapula