Tamás S Illés1,2,3, Máté Burkus4, Szabolcs Somoskeőy5, Fabien Lauer6, Francois Lavaste7, Jean F Dubousset8. 1. Department of Orthopaedics and Traumatology, Brugmann University Hospital, Université Libre de Bruxelles, Place Van Gehuchten 4, 1020, Brussels, Belgium. tamasilles58@yahoo.com. 2. Department of Orthopaedic Surgery and Traumatology, Odense University Hospital and Institute of Clinical Research, University of Southern Denmark, Odense, Denmark. tamasilles58@yahoo.com. 3. National Medical Academy, Paris, France. tamasilles58@yahoo.com. 4. Department of Traumatology and Hand Surgery, Petz Aladár County Teaching Hospital, Győr, Hungary. 5. Orthopaedic Department, University Clinical Centre, Pécs University, Pécs, Hungary. 6. LORIA, Lorraine Research Laboratory in Computer Science and its Applications, University of Lorraine, Nancy, France. 7. Institute of Biomechanics Human Georges Charpak, Arts et Metiers ParisTech, Paris, France. 8. National Medical Academy, Paris, France.
Abstract
PURPOSE: A posterior-anterior vertebral vector is proposed to facilitate visualization and understanding of scoliosis. The aim of this study was to highlight the interest of using vertebral vectors, especially in the horizontal plane, in clinical practice. METHODS: We used an EOS two-/three-dimensional (2D/3D) system and its sterEOS 3D software for 3D reconstruction of 139 normal and 814 scoliotic spines-of which 95 cases were analyzed pre-operatively and post-operatively, as well. Vertebral vectors were generated for each case. Vertebral vectors have starting points in the middle of the interpedicular segment, while they are parallel to the upper plate, ending in the middle of the segment joining the anterior end plates points, thus defining the posterior-anterior axis of vertebrae. To illustrate what information could be obtained from vertebral vector-based top-view images, representative cases of a normal spine and a thoracic scoliosis are presented. RESULTS: For a normal spine, vector projections in the transverse plane are aligned with the posterior-anterior anatomical axis. For a scoliotic spine, vector projections in the horizontal plane provide information on the lateral decompensation of the spine and the lateral displacement of vertebrae. In the horizontal plane view, vertebral rotation and projections of the sagittal curves can also be analyzed simultaneously. CONCLUSIONS: The use of posterior-anterior vertebral vector facilitates the understanding of the 3D nature of scoliosis. The approach used is simple. These results are sufficient for a first visual analysis furnishing significant clinical information in all three anatomical planes. This visualization represents a reasonable compromise between mathematical purity and practical use.
PURPOSE: A posterior-anterior vertebral vector is proposed to facilitate visualization and understanding of scoliosis. The aim of this study was to highlight the interest of using vertebral vectors, especially in the horizontal plane, in clinical practice. METHODS: We used an EOS two-/three-dimensional (2D/3D) system and its sterEOS 3D software for 3D reconstruction of 139 normal and 814 scoliotic spines-of which 95 cases were analyzed pre-operatively and post-operatively, as well. Vertebral vectors were generated for each case. Vertebral vectors have starting points in the middle of the interpedicular segment, while they are parallel to the upper plate, ending in the middle of the segment joining the anterior end plates points, thus defining the posterior-anterior axis of vertebrae. To illustrate what information could be obtained from vertebral vector-based top-view images, representative cases of a normal spine and a thoracic scoliosis are presented. RESULTS: For a normal spine, vector projections in the transverse plane are aligned with the posterior-anterior anatomical axis. For a scoliotic spine, vector projections in the horizontal plane provide information on the lateral decompensation of the spine and the lateral displacement of vertebrae. In the horizontal plane view, vertebral rotation and projections of the sagittal curves can also be analyzed simultaneously. CONCLUSIONS: The use of posterior-anterior vertebral vector facilitates the understanding of the 3D nature of scoliosis. The approach used is simple. These results are sufficient for a first visual analysis furnishing significant clinical information in all three anatomical planes. This visualization represents a reasonable compromise between mathematical purity and practical use.
Entities:
Keywords:
3D visualisation; EOS; Scoliosis; Spine; Vertebral vector
Authors: R G Burwell; A A Cole; T A Cook; T B Grivas; A W Kiel; A Moulton; A S Thirlwall; S S Upadhyay; J K Webb; S A Wemyss-Holden Journal: Acta Orthop Belg Date: 1992 Impact factor: 0.500