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Difficulty: MediumOrthopedic Surgery

A 24-year-old university student presents to the outpatient clinic reporting persistent right wrist pain. Approximately 24 hours ago, he fell forward while skateboarding and braced his impact with an outstretched right hand. He describes a constant, dull ache located near the base of his thumb. On physical examination, there is minimal visible swelling and no obvious deformity. Palpation reveals distinct tenderness in the triangular depression on the radial aspect of the wrist when the thumb is fully extended. Capillary refill is less than 2 seconds, and sensation is intact in all digits. Initial anteroposterior, lateral, and scaphoid-view radiographs of the right wrist show no evidence of acute fracture, cortical disruption, or dislocation. Based on these findings, which of the following is the most appropriate next step in patient management?

  1. A
    Apply a supportive elastic compression bandage and advise routine use of nonsteroidal anti-inflammatory drugs
  2. B
    Arrange for an immediate non-contrast computed tomography scan of the right upper extremity
  3. Immobilize the wrist with a thumb spica splint and schedule a follow-up evaluation in 10 to 14 daysAnswer
  4. D
    Consult orthopedic surgery for immediate closed reduction and percutaneous pinning
  5. E
    Inject the symptomatic area with a local anesthetic and corticosteroid preparation

Answer

Immobilize the wrist with a thumb spica splint and schedule a follow-up evaluation in 10 to 14 days
The correct response is to immobilize the wrist with a thumb spica splint and schedule a follow-up evaluation in 10 to 14 days. The scaphoid bone is the most commonly fractured carpal bone, typically resulting from a fall on an outstretched hand (FOOSH). Patients classically present with pain and tenderness in the anatomic snuffbox. A critical feature of scaphoid fractures is that they are frequently occult on initial radiographs, meaning the initial X-rays may appear completely normal in up to 20% of cases. The scaphoid receives its blood supply distally to proximally (retrograde flow), making the proximal pole highly susceptible to avascular necrosis and nonunion if a fracture is not properly immobilized. Therefore, the standard of care for a patient with snuffbox tenderness and negative initial X-rays is to assume an occult fracture is present. The patient must be placed in a thumb spica splint, and radiographs should be repeated in 10 to 14 days, at which time the fracture line usually becomes visible due to osteoclastic bone resorption.

Step-by-Step Solution

1
Analyze the mechanism of injury and physical exam findings.
Fall on an outstretched hand (FOOSH) with tenderness in the anatomic snuffbox.
These findings are the classic presentation of a suspected scaphoid fracture, which carries a high risk of avascular necrosis due to its retrograde blood supply.
2
Evaluate the initial diagnostic imaging.
Initial radiographs are negative for fracture.
Scaphoid fractures are often occult and may not appear on initial X-rays until bone resorption occurs around the fracture site (typically 10-14 days later).
3
Determine the standard of care for a clinically suspected but radiographically negative scaphoid fracture.
Empiric immobilization with a thumb spica splint and delayed repeat imaging.
This conservatively manages the potential fracture, preventing movement that could disrupt the tenuous blood supply and lead to nonunion.

Key Concept

Occult Scaphoid Fracture Management
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Topics

Orthopedic Surgery

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