Certified Hand Therapist (CHT) Practice Exam

How much motion does PIP ROM account for when grasping?

1. 70%

2. 85%

3. 90%

4. 75%

The correct answer is: 85%

The correct answer indicates that proximal interphalangeal (PIP) range of motion (ROM) accounts for a significant portion of the motion required for grasping activities. Grasping involves multiple finger joints, but the PIP joint is particularly crucial because it allows for flexion and extension of the middle phalanx relative to the proximal phalanx. Research highlights that the PIP joint is essential for grip strength and precision during grasping, as it contributes greatly to the overall hand function by enabling the fingers to wrap around objects effectively. The high contribution of PIP ROM reflects the need for this joint to engage actively in various grasping tasks, whether it’s holding, pinching, or grabbing objects. The other percentages indicate less ROM contribution from the PIP joint. A lower percentage would suggest a reduced role of the PIP joint in grasping, which does not align with clinical observations and studies that emphasize its importance. Thus, the assertion that PIP ROM accounts for 85% during grasping underlines the necessity for therapists to focus on this joint's rehabilitation and mobility in their treatment plans.