Certified Hand Therapist (CHT) Practice Exam

Which test measures the oblique retinacular ligament's function?

1. Intrinsic tightness test

2. Extrinsic tightness test

3. Oblique retinacular ligament test

4. Bunnell test

The correct answer is: Oblique retinacular ligament test

The test that assesses the function of the oblique retinacular ligament is specifically designed to evaluate how this ligament contributes to finger flexion and extension, particularly in the context of maintaining proper joint mechanics. The oblique retinacular ligament is important for stabilizing the distal interphalangeal joint during movements of the proximal interphalangeal joint. The oblique retinacular ligament test examines the relationship between flexion at the proximal interphalangeal joint and its effect on the distal interphalangeal joint. By performing this test, therapists can identify any dysfunction or tightness related to the oblique retinacular ligament. This is crucial for diagnosing conditions that may involve alterations in finger functions or joint problems. The other tests mentioned are focused on different aspects of hand function. For example, the intrinsic tightness test evaluates the tightness of the intrinsic muscles of the hand, while the extrinsic tightness test looks at the tightness of the long finger flexors. The Bunnell test assesses the integrity of the tendon repair and joint function following injury or surgery. Each of these focuses on different structures or capabilities within the hand and does not directly measure the oblique retinacular ligament's performance.