Journal article
An investigation of range of motion preservation in fusionless anterior double screw and cord constructs for scoliosis correction
EUROPEAN SPINE JOURNAL, v 32(4), p1173
Apr 2023
PMID: 36871254
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
PurposeTo evaluate the motion-preserving properties of vertebral body tethering with varying cord/screw constructs and cord thicknesses in cadaveric thoracolumbar spines.MethodsIn vitro flexibility tests were performed on six fresh-frozen human cadaveric spines (T1-L5) (2 M, 4F) with a median age of 63 (59-to-80). An +/- 8 Nm load was applied to determine range of motion (ROM) in flexion-extension (FE), lateral bending (LB), and axial rotation (AR) in the thoracic and lumbar spine. Specimens were tested with screws (T5-L4) and without cords. Single (4.0 mm and 5.0 mm) and double (4.0 mm) cord constructs were sequentially tensioned to 100 N and tested: (1) Single 4.0 mm and (2) 5.0 mm cords (T5-T12); (3) Double 4.0 mm cords (T5-12); (4) Single 4.0 mm and (5) 5.0 mm cord (T12-L4); (6) Double 4.0 mm cords (T12-L4).ResultsIn the thoracic spine (T5-T12), 4.0-5.0 mm single-cord constructs showed slight reductions in FE and 27-33% reductions in LB compared to intact, while double-cord constructs showed reductions of 24% and 40%, respectively. In the lumbar spine (T12-L4), double-cord constructs had greater reductions in FE (24%), LB (74%), and AR (25%) compared to intact, while single-cord constructs exhibited reductions of 2-4%, 68-69%, and 19-20%, respectively.ConclusionsThe present biomechanical study found similar motion for 4.0-5.0 mm single-cord constructs and the least motion for double-cord constructs in the thoracic and lumbar spine suggesting that larger diameter 5.0 mm cords may be a more promising motion-preserving option, due to their increased durability compared to smaller cords. Future clinical studies are necessary to determine the impact of these findings on patient outcomes.
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Details
- Title
- An investigation of range of motion preservation in fusionless anterior double screw and cord constructs for scoliosis correction
- Publication Details
- EUROPEAN SPINE JOURNAL, v 32(4), p1173
- Publisher
- SPRINGER; NEW YORK
- Grant note
- Funding for this study was provided by Globus Medical, Inc. (GMI)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Drexel University
- Web of Science ID
- WOS:000943693000001
- Scopus ID
- 2-s2.0-85149231124
- Other Identifier
- 991021860730604721
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- Collaboration types
- International collaboration
- Web of Science research areas
- Clinical Neurology
- Orthopedics