National Physical Therapy Examination (NPTE) Practice Exam

Which wrist motion is likely decreased if there is a reduction in the anterior glide of the carpals at the radiocarpal joint?

1. Wrist flexion

2. Ulnar deviation

3. Radial deviation

4. Wrist extension

The correct answer is: Wrist extension

When considering wrist motion, particularly at the radiocarpal joint, understanding the mechanics of carpal movements is essential. The anterior glide of the carpals at the radiocarpal joint primarily facilitates wrist extension. During this motion, the distal radius and the proximal row of carpals need to glide anteriorly to allow for greater extension at the wrist. A reduction in the anterior glide of the carpals means that the main movement contributing to wrist extension is impaired. As a result, reaching full extension would be difficult, reflecting a decrease in this specific wrist motion. Therefore, if the anterior glide at the radiocarpal joint is compromised, it leads directly to a decreased capacity for wrist extension. In contrast, wrist flexion, ulnar deviation, and radial deviation involve different mechanics and do not directly hinge on the anterior glide of the carpals for their range of motion. Each of these motions involves varying degrees of carpal movement but is less directly affected by limitations in anterior glide compared to wrist extension.