Abstract
Scaphoid is the critical lateral column link between the proximal and distal rows of the carpus. During radial deviation, the lateral column must shorten however the apparent differential rotation and relationships between the scaphoid, lunate and trapezium is not well explained by existing carpal kinetic theories. Nor is the mechanism by which the lunate remains a mobile but stable intercalated segment. By obtaining 3D CT scans of the normal and abnormal wrist in various positions of coronal and sagittal deviation, and then creating motion sequences using a step frame animation technique, the dynamic relationships between the various carpal bones can be demonstrated, ligamentous constraints inferred, and pathological and reconstructive options evaluated.
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