A less than optimal lateral hand projection demonstrating the longest of the second through fifth metacarpal midshafts situated anterior to the others
A) was obtained with the hand internally rotated.
B) may result if the central ray was centered too anteriorly.
C) will also demonstrate closed IP joints.
D) will also demonstrate the distal scaphoid posterior to the pisiform.

Question

Quizplus · Accepted Answer

This occurs because internal rotation of the hand positions the metacarpals so that they overlap each other more than when the hand is in a true lateral position, making the one furthest from the source of the X-ray (usually the second or third metacarpal) appear the longest.

A Less Than Optimal Lateral Hand Projection Demonstrating the Longest