Acromioclavicular joint series
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The acromioclavicular (AC) joint radiographic series is used to evaluate the acromioclavicularjoint and the distal clavicle.
Indications
AC radiographs are performed for a variety of indications including:
- shoulder trauma
- direct blows to the
shouldshoulder region - following a fall onto an adducted arm
- suspected dislocation
- suspected arthritis
Projections
Standard projections
-
AP view
- erect view demonstrating the AC joint in the anteroposterior plane
- best view to inspect widening of the AC joint
Additional projections
-
AP with weight bearing
- also known as a stress view, the patient holds onto a weight on the affected side, placing inferior pressure on the AC joint
- this view is used to rule out displacement when it is suspected yet not confirmed on the AP view
- AP comparison views
- both AC joints are imaged separately, to rule out a suspected displacement or differentially anatomical variation
-
Zanca view
- AP projection with a 10-15 degree cephalad angle to free the AC joint from superimposition
-<li>direct blows to the should region</li>-<li>following a fall onto adducted arm</li>- +<li>direct blows to the shoulder region</li>
- +<li>following a fall onto an adducted arm</li>
-<a title="Acromioclavicular joint (Zanca view)" href="/articles/acromioclavicular-joint-zanca-view">Zanca view</a><ul><li>AP projection with a 10-15 degree cephalad angle to free the AC joint from superimposition </li></ul>- +<a href="/articles/acromioclavicular-joint-zanca-view">Zanca view</a><ul><li>AP projection with a 10-15 degree cephalad angle to free the AC joint from superimposition </li></ul>
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