Which two anatomical points should be included in an anteroposterior (AP) projection of the fifth digit of the foot?

In an anteroposterior (AP) projection of the fifth digit of the foot, including the Metatarsophalangeal (MTP) joint of the fifth digit and the Interphalangeal (IP) joint of the fifth digit is crucial for a comprehensive view of the digit's anatomy.

The MTP joint serves as a key reference point because it is where the metatarsal bone connects to the proximal phalanx of the fifth digit, providing insight into the alignment and any potential abnormalities at the base of the toe. The IP joint, on the other hand, is significant as it represents the articulation between the proximal and distal phalanges, allowing for evaluation of the segment of the toe further from the MTP joint.

This combination of anatomical points ensures that all crucial parts of the fifth digit are captured in the imaging, which is essential for assessing any fractures, dislocations, or other pathologies. The other options do not include the necessary combinations that address both the base (MTP) and the tip (IP joint) of the fifth digit, leading to a less effective radiographic evaluation.