Which imaging view is typically best to evaluate AC joint injury on radiographs?

Which imaging view is typically best to evaluate AC joint injury on radiographs?

• A. Bilateral AC joint views including a Z-view or single axillary view
• B. AP shoulder view
• C. Lateral scapula view
• D. MRI of shoulder

Answer: (A)

Dedicated AC joint radiographs that compare both sides are the most effective way to evaluate AC joint injuries. The Z-view is an oblique projection that specifically highlights the AC joint space, making widening or displacement easier to see. An axillary view, even if performed as a single projection, provides a different angle to assess any posterior or anterior displacement of the clavicle relative to the acromion. Together, these views give a clear picture of AC separation. In contrast, a standard AP shoulder view can miss subtle AC joint damage because the joint is not optimally visualized, and a lateral scapula view isn’t aimed at the AC joint. MRI is useful for soft-tissue assessment but isn’t the first-line radiographic view to diagnose AC joint injury.

Dedicated AC joint radiographs that compare both sides are the most effective way to evaluate AC joint injuries. The Z-view is an oblique projection that specifically highlights the AC joint space, making widening or displacement easier to see. An axillary view, even if performed as a single projection, provides a different angle to assess any posterior or anterior displacement of the clavicle relative to the acromion. Together, these views give a clear picture of AC separation.

In contrast, a standard AP shoulder view can miss subtle AC joint damage because the joint is not optimally visualized, and a lateral scapula view isn’t aimed at the AC joint. MRI is useful for soft-tissue assessment but isn’t the first-line radiographic view to diagnose AC joint injury.