In the axiolateral projection (Coyle method) to demonstrate the radial head, how should the patient's arm be positioned?

In the axiolateral projection (Coyle method) used to visualize the radial head, positioning the patient's arm bent at 90 degrees is essential for optimal imaging. This specific positioning helps to ensure that the radial head is best visualized in relation to the capitulum of the humerus. The 90-degree flexion places the radial head in line with the x-ray beam, reducing the potential for superimposition of surrounding structures and allowing for a clearer assessment of any fractures or other pathologies.

This method is particularly important in evaluating elbow injuries where the anatomy must be accurately depicted to make informed clinical decisions. The alignment of the forearm and the perpendicular angle of the x-ray beam with the specific flexion enhance the diagnostic value of the image, making it crucial for proper arm positioning.