Analysis of structural features of deformed spines in frontal and sagittal projections

In the study of spine, two approaches exist. Clinicians still measure directly, either on X-ray films or on digitized images, a small number of angular values characterizing the profile of deformed spines. 3D software programs exist, but they describe the spinal features calculated from a large set number of inputs. An alternative approach is proposed for clinical applications. Frontal and sagittal radiographs are treated separately. Neutral curves are drawn from a small number of records in a small amount of time. Feature parameters accurately describe the spinal shape, and they are the basis for drawing the modeled curve of the spine. These parameters facilitate the follow up of evolutive back pathologies. Several examples display the new technique.

[1]  H Labelle,et al.  [Comparison between clinical Cobb angles and measurements performed on vertebral bodies, pedicle centroids and spinous processes]. , 1999, Annales de chirurgie.

[2]  C. L. Nash,et al.  Spinal analysis using a three-dimensional radiographic technique. , 1976, Journal of biomechanics.

[3]  S. Laporte,et al.  Three-dimensional (3D) detailed reconstruction of human vertebrae from low-dose digital stereoradiography , 2003, European Journal of Orthopaedic Surgery & Traumatology.

[4]  Tadeusz J. Janik,et al.  Radiographic Analysis of Lumbar Lordosis: Centroid, Cobb, TRALL, and Harrison Posterior Tangent Methods , 2001, Spine.

[5]  Y L Chen,et al.  Vertebral centroid measurement of lumbar lordosis compared with the Cobb technique. , 1999, Spine.

[6]  Tadeusz J. Janik,et al.  Reliability of Centroid, Cobb, and Harrison Posterior Tangent Methods: Which to Choose for Analysis of Thoracic Kyphosis , 2001, Spine.

[7]  J. T. Case.  Roentgenologische Beobachtungen ueber die Bewegungen der Wirbelsaule , 1932 .

[8]  H. Labelle,et al.  Analysis of the Sagittal Balance of the Spine and Pelvis Using Shape and Orientation Parameters , 2005, Journal of spinal disorders & techniques.

[9]  H Labelle,et al.  Optimized vertical stereo base radiographic setup for the clinical three-dimensional reconstruction of the human spine. , 1994, Journal of biomechanics.

[10]  Eric Berthonnaud,et al.  Inferior limb stereoradiography: Technique and applications in clinical practice , 1998 .