Certified Hand Therapist (CHT) Practice Exam

Which of the following is NOT a role of the oblique retinacular ligament?

1. Facilitating DIP extension

2. Maintaining PIP extension

3. Stabilizing the PIP joint

4. Preventing excessive dorsal movement

The correct answer is: Stabilizing the PIP joint

The oblique retinacular ligament (ORL) is primarily involved in the mechanics of the fingers, particularly in the coordination of motions between the proximal interphalangeal (PIP) joint and the distal interphalangeal (DIP) joint. One of its main functions is to facilitate the extension of the DIP joint by connecting to the lateral bands of the extensor mechanism, which transmit force during extension. Also, the oblique retinacular ligament plays a vital role in maintaining the relative positions of the PIP and DIP joints during flexion and extension activities, which helps prevent excessive dorsal movement. As the PIP is extended, the ORL assists in allowing the DIP to extend concurrently, thus influencing finger function and grip. While the ligaments do contribute to the stability of these joints, the specific stabilizing role of the ORL does not equal that of the other ligaments involved in directly stabilizing the PIP joint itself, such as the collateral ligaments. As such, stating that the ORL stabilizes the PIP joint is inaccurate since its primary function does not involve direct stabilization but rather coordination and facilitation of motion.