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