Scaphoid kinematics in vivo.
The purpose of this study was to quantify 3-dimensional (3-D) in vivo scaphoid kinematics during flexion-extension motion (FEM) and radial-ulnar deviation (RUD) of the hand. The right wrists of 11 healthy volunteers were imaged by spiral computed tomography during RUD and 5 of those wrists also during FEM. With a matching technique, relative translations and rotations of the scaphoids were traced. Our results showed a broad spectrum of kinematic patterns of the scaphoid during RUD, with small intercarpal motions within the proximal carpal row. Some scaphoids rotated basically around the flexion-extension axis only whereas others rotated almost entirely around the deviation axis during RUD. During FEM we found highly uniform scaphoid motion patterns with large intercarpal motions within the proximal carpal row. These findings suggest that current theories cannot sufficiently explain wrist kinematics and stress the need for more in vivo studies on 3-D carpal kinematics.
Moojen
Thybout M
TM
Department of Plastic Surgery, Academic Medical Center, Amsterdam, The Netherlands.
Snel
Jeroen G
JG
Ritt
Marco J P F
MJ
Venema
Henk W
HW
Kauer
John M G
JM
Bos
Kurt E
KE
D000328:Adult; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D009068:Movement / Q000502:physiology*; D011884:Radius / Q000000981:diagnostic imaging / Q000502:physiology*; D012399:Rotation; D021361:Scaphoid Bone / Q000000981:diagnostic imaging / Q000502:physiology*; D036542:Tomography, Spiral Computed; D014457:Ulna / Q000000981:diagnostic imaging / Q000502:physiology*; D014955:Wrist Joint / Q000000981:diagnostic imaging / Q000502:physiology