Scapula Lateral

Upper Extremity positioning

Scapula Lateral is a radiography positioning projection of the Upper Extremity. Lateral erect, 45-60 degree rotation. CR perpendicular to scapular body. SID 40". The centering point is located midscapular area, with body rotated 45-60 degrees to image the scapula in profile.. The central ray is perpendicular to the scapular body at 45-60 degrees rotation.. Image-quality criteria include scapular body shown in profile without foreshortening., scapular spine visible in profile projecting posteriorly.. Standard exposure ranges from 70 to 80 kVp, 8 to 15 mAs, at an SID of 40 inches (102 cm).

Anatomy demonstrated

  • Scapular body in profile.
  • Scapular spine in profile.
  • Acromion process in profile.
  • Coracoid process.
  • Glenoid cavity in profile.
  • Vertebral border of scapula.

Patient preparation

  • Verify patient identity using two identifiers.
  • Remove watches, bracelets, and radiopaque items from shoulder.
  • Position patient erect, lateral to IR at 45-60 degree rotation.
  • Place arm across the body or abducted 90 degrees as needed.
  • Keep spine straight and shoulders level during exposure.

Position & centering point

Midscapular area, with body rotated 45-60 degrees to image the scapula in profile.

Central ray

Perpendicular to the scapular body at 45-60 degrees rotation.

Exposure / technique

kVp
70–80
mAs
8–15
SID
40" (102 cm)
Notes
Erect technique. Body rotated 45-60 degrees for proper profile orientation. Arm positioned across body or at 90 degrees.

Image-quality criteria

  • Scapular body shown in profile without foreshortening.
  • Scapular spine visible in profile projecting posteriorly.
  • Acromion and coracoid processes visible in profile.
  • Minimal rib superimposition of scapular body.
  • Glenoid cavity imaged in profile.
  • Collimation: 1 inch above shoulder, 1 inch beyond lateral edge.

Common errors / ARRT traps

  1. 1 Insufficient rotation fails to show scapula in true profile.
  2. 2 Excessive rotation rotates the scapula superiorly or inferiorly.
  3. 3 Rib superimposition obscures scapular detail.
  4. 4 Arm position not open enough keeps scapula foreshortened.
  5. 5 Off-centered CR misses the scapular body or spine.

Clinical indications

  • Scapular body fracture evaluation in profile.
  • Scapular spine fracture or displacement assessment.
  • Rotator cuff pathology evaluation.
  • Post-operative scapular fixation follow-up.

Aligned to the 2025 ARRT Content Specifications.

Practice this projection live.

The interactive positioning viewer in the app lets you rotate the patient, see the centering point in 3D, and study the central ray angle. Start free.

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