How should the elbow be positioned for an AP elbow radiograph?

For an AP elbow radiograph, the proper positioning of the elbow is for it to be fully extended over the cassette. This positioning allows for a clear and comprehensive view of the elbow joint, including the humerus, radius, and ulna, ensuring that all critical structures are visible without overlaps that could obscure the anatomy.

Extending the elbow helps to create a more uniform image by aligning the joints appropriately within the plane of the film. When the elbow is fully extended, it provides an optimal view of the joint space, which is crucial for assessing any pathological conditions, fractures, or joint alignment. This technique also helps in obtaining a true anteroposterior projection, which is essential for accurate diagnosis and interpretation by the radiologist.

Other options may not provide the necessary clarity and precision needed in the radiographic assessment of the elbow joint. For instance, flexing the arm at around 90 degrees would alter the view and could obscure critical anatomy. Similarly, wrist rotation or positioning the forearm parallel to the floor does not align with the standard guidelines for obtaining an AP view.