Wrist Kinematics from Computed Tomography Data

摘要

Three-dimensional (3-d) surface models of human carpal bones obtained from Computed Tomography (CT) were used to investigate their kinematic behavior throughout the entire physiological range of motion of the human wrist joint. The 3-d motion of the bones was visualized graphically by the finite helical axis (FHA) and smooth animations. It was found that extension mainly occurs in the radial-carpal joint and flexion is shared between the radial-carpal and midcarpal joints. During radial and ulnar deviation, the relative motion between the scaphoid and lunate was larger than in flexion-extension. This study will improve our understanding of carpal bone motion in a range of wrist poses, and will provide morphological data for the design of a functional wrist replacement arthroplasty.