College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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A boy falls on his outstretched hand and tears the annular ligament. Which joint is this ligament associated with?

Distal interphalangeal (DIP) joint
Glenohumeral (shoulder) joint
Proximal radioulnar joint
Radiocarpal joint

The correct answer is: Radiocarpal joint

The annular ligament is primarily associated with the proximal radioulnar joint. This ligament encircles the head of the radius, allowing it to rotate smoothly during pronation and supination of the forearm. When someone falls on an outstretched hand, the force can lead to injuries around the elbow, particularly affecting the stability provided by the annular ligament, which is crucial for the proper function of the proximal radioulnar joint. The distal interphalangeal joint is involved in the fingers, while the glenohumeral joint is the shoulder joint. The radiocarpal joint is the wrist joint, which does not incorporate the annular ligament in its structure or function. Thus, recognizing that the annular ligament's primary role is linked with the proximal radioulnar joint is essential for understanding the mechanics of upper limb injuries.