Why is the postero-anterior projection preferred over the antero-posterior projection for wrist radiography?

The postero-anterior projection is preferred for wrist radiography primarily because it provides better contact between the wrist and the film. This optimal contact ensures that the anatomical structures of the wrist are projected more accurately onto the radiographic film or detector, reducing the risk of motion blur and improving the overall quality of the image.

When the wrist is positioned in a postero-anterior manner, the layout of the wrist bones, including the carpal bones, becomes clearer, facilitating a more precise evaluation of fractures or other pathologies. This positioning allows the radiologic technologist to capture a more detailed image, which is vital for accurate diagnosis and treatment planning.

While other factors like minimizing patient discomfort and enhancing image resolution do have roles in radiography, the critical aspect of ensuring tight film contact stands out as a primary reason for the preference of postero-anterior projections in wrist imaging.