What degree of flexion is required for the elbow in the axiolateral projection (Coyle method) to demonstrate the coronoid process of the ulna?

The angle of elbow flexion required for the axiolateral projection (Coyle method) to effectively demonstrate the coronoid process of the ulna is 80 degrees. This specific degree of flexion is crucial as it allows for optimal visualization of the coronoid process without superimposition. The intentional angle helps to project the anatomy in such a way that it minimizes obscuration from surrounding structures and maximizes the clarity of the coronoid process in the resulting radiograph.

In the context of the projection, achieving exactly 80 degrees of flexion positions the ulna appropriately relative to the x-ray beam, enhancing the diagnostic value of the image. Adjusting the flexion angle can lead to less effective visualization of the coronoid process, making this precise degree essential for the intended outcome of the imaging technique.