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Title of Journal: Eur Spine J

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Abbravation: European Spine Journal

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Springer Berlin Heidelberg

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10.1016/0042-6822(62)90227-1

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1432-0932

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Interest of T1 parameters for sagittal alignment e

Authors: S Pesenti B Blondel E Peltier E Choufani G Bollini J L Jouve
Publish Date: 2015/10/03
Volume: 25, Issue: 2, Pages: 424-429
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Abstract

In the last few years several reports stressed the importance of sagittal alignment in adolescent idiopathic scoliosis AIS patients It was recently reported that T1 slope defined as the angle between the superior endplate of T1 and the horizontal correlates strongly with overall sagittal parameters The aim of this study was to assess the impact of T1 parameters T1slope and T1tilt on sagittal alignment of AIS hypokyphotic patients preoperatively and postoperativelyTwentynine AIS patients with 20° preoperative hypokyphosis were included in a retrospective study Surgery systematically comprised hybrid construct with screws below T11 sublaminar bands at thoracic level and a laminolaminar claw on the upper instrumented vertebra Preoperative postoperative and 2year followup radiological assessment included Cobb angle T1 slope T1 sagittal tilt regional sagittal parameters and pelvic parametersIn the series as a whole coronal Cobb angle was significantly reduced postoperatively 58° vs 17° p  0001 thoracic kyphosis significantly improved 124° vs 256° p  0001 and cervical lordosis significantly restored 62° kyphosis vs 41° lordosis p  0001 There was a significant modification in T1slope 102° vs 182° p  0001 Preoperatively T1 slope was significantly correlated with T1 tilt r = 0427 p = 0029 Postoperatively T1 slope was significantly correlated with T1 tilt r = 0549 p = 0002 thoracic kyphosis r = 0535 p = 0005 and cervical lordosis r = −0444 p = 003 Restoration of cervical lordosis was significantly correlated to changes of T1slope r = −0393 p = 0032 which was significantly correlated to postoperative thoracic kyphosisAccording to these results T1 seems to be of major interest in postoperative modifications of sagittal alignment T1 slope and sagittal tilt are good indicators of postoperative changes for regional cervical lordosis and thoracic kyphosis and global parameters We therefore consider these parameters as essential in the assessment of AIS patients Further studies and correlation with clinical scores will however be necessary in order to confirm the present findings

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