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

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The mechanism of injury (M.O.I.) most commonly causing scaphoid fractures is known as what?

Direct Compression
FOOSH (Falling Onto OutStretched Hand)
Sudden Twist
Jumping Impact

The correct answer is: FOOSH (Falling Onto OutStretched Hand)

The mechanism of injury commonly associated with scaphoid fractures is Falling Onto an Outstretched Hand, often abbreviated as FOOSH. This type of injury typically occurs when a person falls and instinctively extends their arm forward to break the fall, which places significant stress on the wrist. The scaphoid is a critical bone in the wrist located near the base of the thumb, and in this position, it is particularly vulnerable to fractures due to the force transmitted through the wrist joint during the impact. In the context of a FOOSH injury, the falling force can lead to a fracture of the scaphoid bone because of its anatomical positioning and the mechanics of how impact forces are distributed through the wrist. Scaphoid fractures are notable for their potential complications, such as non-union or avascular necrosis, due to the limited blood supply to the bone. Understanding this mechanism is crucial for diagnosing and treating wrist injuries effectively. Other mechanisms, such as direct compression or sudden twisting, do not specifically correlate with the typical presentation of scaphoid fractures, and jumping impact injuries are less common causes as well.