Acromioclavicular (AC) Joints Projections

Patient Preparation

• Explain the procedure to the patient.
• Remove jewelry or metallic objects from the shoulder and upper chest area.
• Position the patient comfortably, standing or seated.
• Use lead shielding as appropriate.

BASIC PROJECTIONS

1. AP Projection — AC Joints (Bilateral)

Positioning:

• Patient standing or seated, facing the IR.
• Both shoulders in the same plane.
• Arms relaxed at the sides.
• For stress view (if indicated), patient may hold weights in hands.

Central Ray (CR):

• Perpendicular to IR.
• Directed to midline at level of AC joints.

SID:

• 100–110 cm (40–44 inches).

Collimation:

• Include both AC joints and lateral ends of clavicles.

Common Pathologies Demonstrated

• AC joint separation or dislocation.
• Osteoarthritis or degenerative changes.
• Trauma to lateral clavicle or acromion.