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- The scaphoid is the most commonly fractured carpal bone.
- This bone is the stabilizer between the distal and proximal carpal rows.
- Injury may result in arthritis, avascular necrosis, or malunion.
- Classified as:
- Proximal 3rd (10–20%)
- Middle 3rd (the waist, 70–80%)
- Distal 3rd (the tuberosity)
- Tubercle fractures
- Fractures are missed on initial radiographs 10–15% of the time, and delayed diagnosis greatly increases risk of complications.
- The blood supply to the scaphoid enters distally
- The more proximal the fracture, the higher the likelihood for avascular necrosis
- As the wrist is forcibly hyperextended, the volar aspect of the scaphoid fails in tension and the dorsal aspect fails in compression resulting in a fracture.
Generally results from a fall on an outstretched (dorsiflexed) hand (FOOSH injury).