What is a common mechanism of injury for a scaphoid fracture?

• A. Direct blow to the wrist
• B. Twisting injury
• C. Fall on an outstretched hand
• D. Repetitive wrist flexion

Answer: (C)

A scaphoid fracture is commonly associated with a fall on an outstretched hand (FOOSH injury). This occurs when an individual falls and instinctively tries to catch themselves with their hands. The impact forces transmitted through the wrist during this kind of fall can lead to a fracture of the scaphoid bone, which is located at the base of the thumb in the wrist.

When the wrist is extended and the force of the fall is directed through the arm, this specific positioning can place significant stress on the scaphoid, making it susceptible to injury. The scaphoid bone has a unique blood supply and is notorious for delayed healing and complications when fractured, making recognition of this mechanism critical for timely diagnosis and management.

Although a direct blow to the wrist, a twisting injury, or repetitive wrist flexion may lead to various wrist injuries, they are less specifically associated with the well-known mechanism for scaphoid fractures compared to a fall on an outstretched hand. Understanding this mechanism is crucial for clinicians to accurately assess potential wrist injuries in patients who report falling while keeping their arms extended for impact support.