Introduction and Aims: Kinematic and morphologic suggests the scaphoid may be moved differently between individuals. This study therefore aims to determine to what extent the morphology and ligamentous support of the scaphoid supports the suggestion of variable scaphoid motion. The influence of scaphoid motion on the remainder of the carpus will be considered.

Method: Embalmed specimens were either dissected (n=50) using 3x loupes, sectioned histologically (n=30) or sectioned macroscopically (n=20).

Results: Two distinct morphological patterns were observed. Some scaphoids had a shallow capitate facet and were supported by a series of ligaments that may prevent flexion/extension, but allow/facilitate rotation about the longitudinal axis of the scaphoid. Others had deeply concave capitate facets and were supported by ligaments that may prevent rotation but allow flexion/ extension. These patterns may be continuous throughout the proximal row of the carpus.

Conclusion: Two morphological patterns may dictate the mechanical pattern of the carpus. A flexing and extending scaphoid is restricted by the capitate to its radial position, while a rotating scaphoid may be allowed to translate along the proximoulnar aspect of the capitate.