A new method to measure vertebral rotation from CT scans

Abstract CT measurement methods have good reliability for idiopathic scoliosis transverse plane deformity evaluation. However, because of application difficulties and variations in how these methods are applied, more sensitive methods are needed. This paper presents a new method for measurement of vertebral rotation from tomographic scans. First, the method was subject to clinical, intra-observer and inter-observer analysis. Twenty-three patients with adolescent idiopathic scoliosis were studied to test the clinical reliability of this method. There were no statistical differences between the results of the new method and Ho’s method (P = 0.3380) in the clinical study. Intra-observer and inter-observer analysis showed that this method was reliable. An experimental study was then conducted to show the confidence limits of our new method, which were found to be ± 1.6°, and there was no significant difference between the mean rotation value obtained from CT scans using our new method and that obtained using the mechanical method. These results suggest that our new method is a simple, practical and reliable method for measurement of vertebral rotation from CT scans.

[1]  S. Göçen,et al.  Evaluation of computed tomographic methods to measure vertebral rotation in adolescent idiopathic scoliosis: an intraobserver and interobserver analysis. , 1998, Journal of spinal disorders.

[2]  F Lavaste,et al.  Quantification of Three-Dimensional Vertebral Rotations in Scoliosis: What Are the True Values? , 1995, Spine.

[3]  R Perdriolle,et al.  Morphology of scoliosis: three-dimensional evolution. , 1987, Orthopedics.

[4]  C. L. Nash,et al.  A study of vertebral rotation. , 1969, The Journal of bone and joint surgery. American volume.

[5]  J. Bacon-Shone,et al.  A Comparative Study of Computed Tomographic and Plain Radiographic Methods to Measure Vertebral Rotation in Adolescent Idiopathic Scoliosis , 1992, Spine.

[6]  R. Betz,et al.  Computer Tomography Evaluation of Cotrel‐Dubousset Instrumentation in Idiopathic Scoliosis , 1988, Spine.

[7]  B. S. Richards.  Measurement Error in Assessment of Vertebral Rotation Using the Perdriolle Torsionmeter , 1992, Spine.

[8]  B Drerup,et al.  Principles of measurement of vertebral rotation from frontal projections of the pedicles. , 1984, Journal of biomechanics.

[9]  S Aaro,et al.  Estimation of Vertebral Rotation and the Spinal and Rib Cage Deformity in Scoliosis by Computer Tomography , 1981, Spine.

[10]  D. Hill,et al.  A Comparison of Four Computerized Methods for Measuring Vertebral Rotation , 1990, Spine.

[11]  J C Leong,et al.  New methods of measuring vertebral rotation from computed tomographic scans. An intraobserver and interobserver study on girls with scoliosis. , 1993, Spine.

[12]  M S Moreland,et al.  Measurement of Axial Rotation of Vertebrae in Scoliosis , 1986, Spine.

[13]  S. Aaro,et al.  The longitudinal axis rotation of the apical vertebra, the vertebral, spinal, and rib cage deformity in idiopathic scoliosis studied by computer tomography. , 1981 .

[14]  R Bauer,et al.  Axial Rotation Measurement of Scoliotic Vertebrae by Means of Computed Tomography Scans , 1996, Spine.

[15]  A. Schultz,et al.  Roentgenographic evaluation of vertebral rotation. , 1976, The Journal of bone and joint surgery. American volume.

[16]  M. Mehta.  Radiographic estimation of vertebral rotation in scoliosis. , 1973, The Journal of bone and joint surgery. British volume.

[17]  J W Frymoyer,et al.  A biplane radiographic method of determining vertebral rotation in postmortem specimens. , 1976, Clinical orthopaedics and related research.