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Scaphoid Fractures

Wrist bone fracture after a fall on the outstretched hand

Scaphoid

Overview

The Science of Scaphoid Fractures

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The scaphoid sits between the two rows of carpal bones and acts as a bridge between them, so a large share of the load crossing your wrist passes through it. That position is also what makes it vulnerable: a fall onto an outstretched hand with the wrist extended drives force directly across the bone.

What makes the scaphoid different from most fractures is its blood supply. Vessels enter near the far end of the bone and travel backwards through it, so a fracture through the middle or the near end can interrupt supply to the fragment closest to the forearm. That fragment then has limited ability to heal, which is why these fractures are associated with delayed healing, , and in some cases loss of blood supply to the bone.

Early scaphoid fractures are frequently missed. Swelling is often modest, the wrist can still move, and initial X-rays can appear normal even when a fracture is present. Persistent tenderness in the hollow at the base of the thumb after a fall warrants medical assessment and further imaging, such as repeat X-ray, CT or MRI, rather than reassurance from a single normal film.

Overview

Contributing Factors

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The classic mechanism is a fall onto an outstretched hand, usually with the wrist bent backwards and angled toward the thumb. Sports with a high fall risk at speed account for many of these injuries, as do falls from standing in older adults and workplace slips.

Because the wrist often still moves and grip is only moderately reduced, the injury can be mistaken for a sprain and managed with rest alone. Continuing to load the wrist through a fracture that has not been identified is what allows a healing problem to develop, so the priority in the early stage is accurate diagnosis and appropriate immobilisation rather than early rehabilitation.

Once the fracture has been managed and healing is confirmed, rehabilitation addresses the stiffness, grip weakness and forearm rotation loss that follow a period of immobilisation, and rebuilds tolerance for loading through the wrist.

Conditions I commonly see alongside, or confused with, this one.

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