Pseudoarthritis in the wrist. Coloured computer tomography (CT) scan of the non-union of a bone transplant of the scaphoid bone in the wrist. A bone transplant is used to replace loose bone or provide structural support, for example in the event of a fracture. The scaphoid bone, found near the thumb (centre left), is the most frequently fractured wrist (carpal) bone. However, its position near the thumb means that it does not recieve a good supply of blood and as a consequence can fail to heal. If a fracture fails to heal, smooth fibrocartilage grows over the fracture site, as has happened here.
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