Certified Hand Therapist (CHT) Practice Exam

What is the primary function of the transverse retinacular ligament?

1. To support the flexor tendons during extension

2. To prevent dorsal shift of lateral bands during PIP extension

3. To stabilize the metacarpophalangeal joints

4. To facilitate the movement of the flexor tendons

The correct answer is: To prevent dorsal shift of lateral bands during PIP extension

The primary function of the transverse retinacular ligament is indeed to prevent dorsal shift of the lateral bands during proximal interphalangeal (PIP) extension. This ligament plays a crucial role in maintaining the proper alignment of the extensor tendons over the finger joints. When the PIP joint is extended, the lateral bands, which are extensions of the extensor mechanism, can be prone to shifting dorsal (toward the back of the hand). The transverse retinacular ligament helps to anchor these lateral bands in place, allowing for coordinated and effective finger extension without compromise to the joint's stability. This function is essential in ensuring that the extensor tendons can exert force efficiently across the joints involved in finger movement, minimizing the risk of deformities and improving overall hand function. By providing this stabilization, the transverse retinacular ligament aids in maintaining optimal biomechanics during finger motions, which is critical especially in rehabilitation contexts handled by certified hand therapists.