Alice Baroncini1,2,3, Aurelien Courvoisier4, Pedro Berjano5, Filippo Migliorini6, Jörg Eschweiler6, Philipp Kobbe6, Frank Hildebrand6, Per David Trobisch7. 1. Department of Spine Surgery, Eifelklinik St. Brigida, Simmerath, Germany. alice.baroncini@artemed.de. 2. IRCCS Istituto Ortopedico Galeazzi, Milano, Italy. alice.baroncini@artemed.de. 3. Department of Orthopaedics and Trauma Surgery, RWTH Aachen University Clinic, Pauwelsstrasse 30, 52074, Aachen, Germany. alice.baroncini@artemed.de. 4. Grenoble Alpes Scoliosis Center, Grenoble Alpes University Hospital, Grenoble, France. 5. IRCCS Istituto Ortopedico Galeazzi, Milano, Italy. 6. Department of Orthopaedics and Trauma Surgery, RWTH Aachen University Clinic, Pauwelsstrasse 30, 52074, Aachen, Germany. 7. Department of Spine Surgery, Eifelklinik St. Brigida, Simmerath, Germany.
Abstract
INTRODUCTION: While the effects of VBT on coronal parameters have been investigated in various studies, this has not yet been the case for sagittal parameters. This is of particular relevance considering that VBT does not allow direct correction of the sagittal profile. Thus, we investigated the effects of VBT on sagittal parameters in patients with adolescent idiopathic scoliosis. MATERIALS AND METHODS: Retrospective, 2-Center study. Patients who underwent VBT and presented a 2-years follow-up were included. The differences in sagittal parameters were evaluated, along with modifications of sagittal profile following Abelin-Genevois' classification. RESULTS: Data from 86 patients were obtained. Mean Cobb angle was 52.4 ± 13.9° at thoracic level and 47.6 ± 14.3° at lumbar level before surgery, and 28.5 ± 13.6 and 26.6 ± 12.7° at the 2-year follow-up, respectively. Mean thoracic kyphosis increased from 28.3 ± 13.8 to 33 ± 13°, the lumbar lordosis (LL) was unvaried (from 47.5 ± 13.1 to 48.4 ± 13.5°), PT decreased from 9.4 ± 8.5 to 7.4 ± 6.1°, the sagittal vertical axis SVA decreased from 4.5 ± 31.4 to - 3.6 ± 27.9 mm. No kyphotic effect on LL in patients who underwent lumbar instrumentation was observed. Before surgery, 39 patients had a type 1 sagittal profile, 18 were type 2a, 14 type 2b and 15 type 3. Postoperatively, 54 were type 1, 8 were 2a, 13 were 2b and 11 were type 3. CONCLUSIONS: VBT positively influences sagittal parameters and does not have a kyphotic effect on LL.
INTRODUCTION: While the effects of VBT on coronal parameters have been investigated in various studies, this has not yet been the case for sagittal parameters. This is of particular relevance considering that VBT does not allow direct correction of the sagittal profile. Thus, we investigated the effects of VBT on sagittal parameters in patients with adolescent idiopathic scoliosis. MATERIALS AND METHODS: Retrospective, 2-Center study. Patients who underwent VBT and presented a 2-years follow-up were included. The differences in sagittal parameters were evaluated, along with modifications of sagittal profile following Abelin-Genevois' classification. RESULTS: Data from 86 patients were obtained. Mean Cobb angle was 52.4 ± 13.9° at thoracic level and 47.6 ± 14.3° at lumbar level before surgery, and 28.5 ± 13.6 and 26.6 ± 12.7° at the 2-year follow-up, respectively. Mean thoracic kyphosis increased from 28.3 ± 13.8 to 33 ± 13°, the lumbar lordosis (LL) was unvaried (from 47.5 ± 13.1 to 48.4 ± 13.5°), PT decreased from 9.4 ± 8.5 to 7.4 ± 6.1°, the sagittal vertical axis SVA decreased from 4.5 ± 31.4 to - 3.6 ± 27.9 mm. No kyphotic effect on LL in patients who underwent lumbar instrumentation was observed. Before surgery, 39 patients had a type 1 sagittal profile, 18 were type 2a, 14 type 2b and 15 type 3. Postoperatively, 54 were type 1, 8 were 2a, 13 were 2b and 11 were type 3. CONCLUSIONS: VBT positively influences sagittal parameters and does not have a kyphotic effect on LL.
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Authors: Alice Baroncini; Aurelien Courvoisier; Pedro Berjano; Filippo Migliorini; Jörg Eschweiler; Philipp Kobbe; Frank Hildebrand; Per David Trobisch Journal: Eur Spine J Date: 2021-12-15 Impact factor: 3.134