Ronit Wollstein*, Hisao Moritomo, Iida Akio and Shohei Omokawa Pages 206 - 209 ( 4 )
Background: The purpose of this study was to investigate scaphoid motion within the scapho-trapezio-trapezoidal (STT) joint during wrist motion in the presence of STT joint osteoarthritis (OA).
Methods: We studied 11 wrists with STT OA and 5 normal wrists. Computed tomography (CT) images were acquired in five wrist positions (maximum active flexion, extension, radial deviation, ulnar deviation, and neutral position). The 3-dimensional surface models of the radius and scaphoid were constructed and the motion of scaphoid relative to the radius was calculated.
Results and Conclusions: During wrist flexion/extension motion, the scaphoid rotated mostly in the flexion/extension plane. The angle tended to be smaller in STT OA than in normal. During wrist radioulnar deviation, the scaphoid was in an extended position in neutral wrist in STT OA. The motion of scaphoid in STT OA was divided into two types: a rigid type and mobile type. The mobile type rotated closer to the flexion/extension plane than the rigid type. Taking into account scaphoid motion during wrist movement before surgery may provide better results in the treatment of STT OA.
Scapho-trapezio-trapezoidal osteoarthritis, scaphoid, kinematic, computed tomography images, wrist motion, 3- dimensional surface bone models, radiographs.
Department of Rheumatology, University of Pittsburgh, Pittsburgh, Yukioka Hospital Hand Center, Osaka Yukioka College of Health Science, Yukioka, Department of Orthopedic Surgery, Hanna Central Hospital, Nara, Department of Hand Surgery, Nara Medical University, Nara