Certified Hand Therapist (CHT) Practice Exam

What happens to the lateral bands during flexion, according to the transverse retinacular ligament's function?

1. They are pulled volarly

2. They are pulled dorsally

3. They are shortened

4. They are lengthened

The correct answer is: They are pulled volarly

The lateral bands of the extensor tendon system play a vital role in maintaining the proper alignment and functioning of the fingers during flexion. When flexion occurs, the transverse retinacular ligament helps to stabilize these lateral bands. Its function is to keep the lateral bands in place, which, when flexion takes place, leads to them being pulled volarly—meaning they are drawn towards the palm of the hand. This pulling action is crucial as it allows the tendons to maintain their effective mechanical advantage during finger movements. The involvement of the transverse retinacular ligament in this process ensures that the lateral bands do not fan out away from the center of the fingers but instead are kept appropriately positioned to assist in flexion and extension. This stabilization aids in coordinated motion and prevents aberrant movements of the extensor tendons, which could compromise joint function and stability.