Certified Hand Therapist (CHT) Practice Exam

What does Landsmeer's ligament refer to?

1. A synonym for the oblique retinacular ligament

2. A type of collateral ligament

3. The dorsal capsule of the PIP joint

4. A type of flexor tendon sheath

The correct answer is: A synonym for the oblique retinacular ligament

Landsmeer's ligament is indeed considered a synonym for the oblique retinacular ligament. This ligament plays a critical role in the function of the finger by connecting the lateral bands of the extensor tendons to the volar plate, assisting in the extension of the proximal interphalangeal (PIP) joint and improving the overall stability of the joint during motion. The role of the oblique retinacular ligament is pivotal in coordinating flexion and extension across the PIP and distal interphalangeal (DIP) joints, which is essential for normal hand function. Understanding the significance of this ligament can help therapists address potential issues that arise with joint mobility or tendon injuries in clinical practice. In contrast, the other options refer to different anatomical structures or functions that do not directly relate to Landsmeer's ligament. For instance, collateral ligaments are structures that provide stability to the joints but are not synonymous with the oblique retinacular ligament. The dorsal capsule of the PIP joint refers to a different aspect of joint anatomy, focusing on stabilization from the dorsal side rather than lateral dynamics. The flexor tendon sheath pertains to the covering and protection of flexor tendons, which is also unrelated to the specific function or naming of the