I S Mat Jais1, S C Tay2. 1. Biomechanics Laboratory, Singapore General Hospital, Singapore. 2. Biomechanics Laboratory, Singapore General Hospital, Singapore; Department of Hand Surgery, Singapore General Hospital, Singapore; Duke-NUS Medical School, Singapore. Electronic address: tay.shian.chao@sgh.com.sg.
Abstract
AIM: To investigate the kinematics of the scaphoid while the wrist was in radioulnar motion using gated four-dimensional computed tomography (4DCT) imaging. MATERIALS AND METHODS: Six cadaveric wrist specimens were scanned in the following order of capsulotomy and ligament sectioning: (1) ligaments intact, (2) capsulotomy, (3) scapholunate ligament division, and lastly, (4) lunotriquetral ligament division. A three-dimensional model was then reconstructed to analyse the translation and angular displacements of the scaphoid. RESULTS: The magnitude of displacement was found to increase with each consecutive ligament sectioning. Translation along the y-axis was statistically significant, with the scaphoid shifting up to 1.39 mm from its original position after complete sectioning of the ligaments while the wrist was deviating radially. Angular displacement about all three axes was statistically significant, with the highest occurring in the flexion-extension plane when the scaphoid flexed by 9.1° from its original position after total sectioning of the ligaments. CONCLUSION: The present study showed that changes in the kinematics of the scaphoid can be detected using 4DCT, thus demonstrating its feasibility in the diagnosis of dynamic carpal instability, which only presents during motion.
AIM: To investigate the kinematics of the scaphoid while the wrist was in radioulnar motion using gated four-dimensional computed tomography (4DCT) imaging. MATERIALS AND METHODS: Six cadaveric wrist specimens were scanned in the following order of capsulotomy and ligament sectioning: (1) ligaments intact, (2) capsulotomy, (3) scapholunate ligament division, and lastly, (4) lunotriquetral ligament division. A three-dimensional model was then reconstructed to analyse the translation and angular displacements of the scaphoid. RESULTS: The magnitude of displacement was found to increase with each consecutive ligament sectioning. Translation along the y-axis was statistically significant, with the scaphoid shifting up to 1.39 mm from its original position after complete sectioning of the ligaments while the wrist was deviating radially. Angular displacement about all three axes was statistically significant, with the highest occurring in the flexion-extension plane when the scaphoid flexed by 9.1° from its original position after total sectioning of the ligaments. CONCLUSION: The present study showed that changes in the kinematics of the scaphoid can be detected using 4DCT, thus demonstrating its feasibility in the diagnosis of dynamic carpal instability, which only presents during motion.
Authors: Brent H Foster; Calvin B Shaw; Robert D Boutin; Anand A Joshi; Christopher O Bayne; Robert M Szabo; Abhijit J Chaudhari Journal: J Biomech Date: 2019-01-24 Impact factor: 2.712
Authors: Stephen S Henrichon; Brent H Foster; Calvin Shaw; Christopher O Bayne; Robert M Szabo; Abhijit J Chaudhari; Robert D Boutin Journal: Skeletal Radiol Date: 2019-07-09 Impact factor: 2.199
Authors: Luca Buzzatti; Benyameen Keelson; Jildert Apperloo; Thierry Scheerlinck; Jean-Pierre Baeyens; Gert Van Gompel; Jef Vandemeulebroucke; Michel de Maeseneer; Johan de Mey; Nico Buls; Erik Cattrysse Journal: Sci Rep Date: 2019-02-04 Impact factor: 4.379