CAMRT Radiography Practice Exam

If a patient cannot extend or rotate their elbow, which position can demonstrate the radial head and neck without superimposition on the proximal ulna?

1. AP projection of the elbow

2. Medial oblique projection

3. Coyle method for radial head

4. Cross-table lateral projection

The correct answer is: Coyle method for radial head

The Coyle method for radial head is specifically designed to visualize the radial head and neck while minimizing superimposition on the proximal ulna. This method is particularly useful when standard projections fail to provide adequate visualization due to the patient's inability to extend or rotate the elbow. In this technique, the arm is positioned in a way that the elbow is flexed at 90 degrees, and the x-ray beam is angled toward the shoulder at approximately 45 degrees. This unique positioning allows for clear visualization of the radial head and neck, distinguishing it from the proximal ulna, as it projects them in such a manner to reduce overlapping structures. This technique is ideal for patients with limitations in mobility, as it does not require them to perform movements that would otherwise put them in discomfort or pain. Additionally, it provides detailed imaging that is essential for diagnosing potential fractures or other pathologies related to the radial head.