Certified Hand Therapist (CHT) Practice Exam

What is a common result of collateral ligament disruption at the PIP joint?

1. Inability to flex the distal phalanx

2. Varus or valgus instability at the joint

3. Complete dislocation of the joint

4. Inflammation of surrounding tissues

The correct answer is: Varus or valgus instability at the joint

Collateral ligament disruption at the proximal interphalangeal (PIP) joint typically results in instability of the joint in the coronal plane, leading to varus (medial) or valgus (lateral) instability. This occurs because the collateral ligaments provide essential support and stability, preventing excessive side-to-side movement of the finger. When these ligaments are disrupted, this stability is compromised, which can manifest as difficulty in maintaining proper alignment of the joint during activities or when stress is applied. The condition can lead to a functional impairment, as the joint may demonstrate abnormal movement patterns or excessive gapping when tested for stability. It is important for hand therapists to recognize this instability during evaluations, as it necessitates specific treatment protocols aimed at restoring joint integrity and function. Proper stabilization and rehabilitation strategies will help in regaining lost function and preventing long-term complications such as joint deformity or chronic pain.