caa a22 4500 44583286X CHVBK 20180317145321.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00586-011-1801-y doi (NATIONALLICENCE)springer-10.1007/s00586-011-1801-y Assessment of two novel surgical positions for the reduction of scoliotic deformities: lateral leg displacement and hip torsion [Elektronische Daten] [Christopher Driscoll, Carl-Eric Aubin, Hubert Labelle, Jean Dansereau] Cobb angles and apical vertebral rotations (AVR) are two of the main scoliosis deformity parameters which spinal instrumentation and fusion techniques aim to reduce. Despite this importance, current surgical positioning techniques do not allow the reduction of these parameters. Two new surgical frame accessory prototypes have been developed: (1) a lateral leg displacer (LLD) allows lateral bending of a patient's legs up to 75° in either direction and (2) a pelvic torsion device (PTD) which allows transverse plane twisting of a patient's pelvis at 30° in either direction while raising the thoracic cushion, opposite to the raised side of the pelvis, by 5cm. The objective of this study was to evaluate the ability of the LLD and PTD to reduce Cobb angles and AVR. Experimental testing was performed pre-operatively on 12 surgical scoliosis patients prone on an experimental surgical frame. Postero-anterior radiographs of their spines were taken in the neutral prone position on a surgical frame, and then again for 6 with their legs bent towards the convexity of their lowest structural curve, 4 with their pelvis raised on the convex side of their lowest structural curve and one each in opposite LLD and PTD intended use. Use of the LLD allowed for an average supplementary reduction of 16° (39%) for Cobb angle and 9° (33%) for AVR in the lowest structural curve. Use of the PTD allowed for an average supplementary reduction of 9° (19%) for Cobb angle and 17° (48%) for AVR in the lowest structural curve. Both devices were most efficient on thoraco-lumbar/lumbar curves. Opposite of intended use resulted in an increase in both Cobb angle and AVR. The LLD and PTD provide interesting novel methods to reduce Cobb angles and AVR through surgical positioning which can be used to facilitate instrumentation procedures by offering an improved intra-operative geometry of the spine. Springer-Verlag, 2011 Spine nationallicence Surgical positioning nationallicence Scoliosis nationallicence Cobb nationallicence Vertebral rotation nationallicence Driscoll Christopher Department of Mechanical Engineering, École Polytechnique de Montréal, Station Centre-Ville, P.O. Box 6079, H3C 3A7, Montreal, QC, Canada aut Aubin Carl-Eric Department of Mechanical Engineering, École Polytechnique de Montréal, Station Centre-Ville, P.O. Box 6079, H3C 3A7, Montreal, QC, Canada aut Labelle Hubert Sainte-Justine University Hospital Center, 3175 Cote-Ste-Catherine Rd, H3T 1C5, Montreal, QC, Canada aut Dansereau Jean Department of Mechanical Engineering, École Polytechnique de Montréal, Station Centre-Ville, P.O. Box 6079, H3C 3A7, Montreal, QC, Canada aut European Spine Journal Springer-Verlag 20/10(2011-10-01), 1711-1719 0940-6719 20:10<1711 2011 20 586 https://doi.org/10.1007/s00586-011-1801-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00586-011-1801-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Driscoll Christopher Department of Mechanical Engineering, École Polytechnique de Montréal, Station Centre-Ville, P.O. Box 6079, H3C 3A7, Montreal, QC, Canada aut NATIONALLICENCE 700 1- Aubin Carl-Eric Department of Mechanical Engineering, École Polytechnique de Montréal, Station Centre-Ville, P.O. Box 6079, H3C 3A7, Montreal, QC, Canada aut NATIONALLICENCE 700 1- Labelle Hubert Sainte-Justine University Hospital Center, 3175 Cote-Ste-Catherine Rd, H3T 1C5, Montreal, QC, Canada aut NATIONALLICENCE 700 1- Dansereau Jean Department of Mechanical Engineering, École Polytechnique de Montréal, Station Centre-Ville, P.O. Box 6079, H3C 3A7, Montreal, QC, Canada aut NATIONALLICENCE 773 0- European Spine Journal Springer-Verlag 20/10(2011-10-01), 1711-1719 0940-6719 20:10<1711 2011 20 586 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer