Effects of trunk position on back surface-contour measured by raster stereophotography. Am J Orthop (Belle Mead NJ) 2002 Jul;31(7):402-6
Date
08/16/2002Pubmed ID
12180626Scopus ID
2-s2.0-0036635776 (requires institutional sign-in at Scopus site) 15 CitationsAbstract
A study of the contour of the surface of the back was conducted using the Quantec spinal image system (QSIS; raster stereophotography) and the Vicon 3-dimensional (3-D) motion analysis system with a plaster model of the scoliotic spine. With postural changes in 3 dimensions came alterations in the surface shape of the back. Most changes in QSIS parameters occurred in the coronal plane. The study showed that model 1, with 9 degrees of Q angle (similar to Cobb angle in the coronal plane) in right thoracolumbar scoliosis, altered 3-D metrics less than model 2 did, with 54 degrees of Q angle in scoliosis. The change in the position of the trunk in the transverse plane had a more significant impact on the QSIS parameters. Raster stereophotography has been used clinically to monitor curve progression. Changes in transverse rotation of the trunk correlate significantly with variations in Q angle and axial rotation. Clinicians using a raster stereophotograph system to assess scoliotic deformity need to control postural sway, as doing so results in more stable and reproducible measurements that can be used for clinical follow-up.
Author List
Liu XC, Thometz JG, Lyon RM, McGrady LAuthors
Xue-Cheng Liu PhD Professor in the Orthopaedic Surgery department at Medical College of WisconsinRoger M. Lyon MD Adjunct Professor in the Orthopaedic Surgery department at Medical College of Wisconsin
John G. Thometz MD Professor in the Orthopaedic Surgery department at Medical College of Wisconsin
MESH terms used to index this publication - Major topics in bold
BackDiagnosis, Computer-Assisted
Humans
Imaging, Three-Dimensional
Models, Anatomic
Moire Topography
Photogrammetry
Posture
Rotation
Scoliosis