CAMRT Radiography Practice Exam

For a patient with suspected anterior shoulder dislocation, what x-rays are most appropriate?

1. Anteroposterior (AP) projection in neutral rotation and anteroposterior (AP) oblique scapular Y

2. Anteroposterior (AP) projection in neutral rotation only

3. Anteroposterior (AP) projection in neutral rotation and a transthoracic lateral humerus

4. Anteroposterior (AP) projection in neutral rotation and posteroanterior (PA) oblique scapular Y

The correct answer is: Anteroposterior (AP) projection in neutral rotation and posteroanterior (PA) oblique scapular Y

In evaluating a patient with a suspected anterior shoulder dislocation, the combination of anteroposterior (AP) projection in neutral rotation and posteroanterior (PA) oblique scapular Y provides crucial information about the shoulder joint's alignment and the position of the humeral head in relation to the glenoid cavity. The AP projection in neutral rotation offers a clear image of the shoulder joint, allowing for an assessment of any dislocation or misalignment. It serves to visualize the general anatomy of the shoulder, identifying potential issues such as fracture or dislocation. The PA oblique scapular Y projection is particularly valuable as it allows visualization of the scapula in profile and helps determine the position of the humeral head in relation to the glenoid cavity. This view is critical for diagnosing anterior dislocations because it can clearly demonstrate the humeral head's displacement anteriorly, which is typical in such cases. This combination of projections enhances diagnostic accuracy by not only confirming dislocation but also by elucidating associated injuries or anatomical variations that could impact treatment. Therefore, the selected answer is indeed the most appropriate choice for assessing a suspected anterior shoulder dislocation.