In Vitro Comparison of Dynesys, PEEK, and Titanium Constructs in the Lumbar Spine
Introduction. Pedicle based posterior dynamic stabilization systems aim to stabilize the pathologic spine while also allowing sufficient motion to mitigate adjacent level effects. Two flexible constructs that have been proposed to act in such a manner, the Dynesys Dynamic Stabilization System and PE...
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| Format: | Article |
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Wiley
2015-01-01
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| Series: | Advances in Orthopedics |
| Online Access: | http://dx.doi.org/10.1155/2015/895931 |
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| author | Matthew S. Yeager Daniel J. Cook Boyle C. Cheng |
| author_facet | Matthew S. Yeager Daniel J. Cook Boyle C. Cheng |
| author_sort | Matthew S. Yeager |
| collection | DOAJ |
| description | Introduction. Pedicle based posterior dynamic stabilization systems aim to stabilize the pathologic spine while also allowing sufficient motion to mitigate adjacent level effects. Two flexible constructs that have been proposed to act in such a manner, the Dynesys Dynamic Stabilization System and PEEK rod, have yet to be directly compared in vitro to a rigid Titanium rod. Methods. Human lumbar specimens were tested in flexion extension, lateral bending, and axial torsion to evaluate the following conditions at L4-L5: Intact, Dynesys, PEEK rod, Titanium rod, and Destabilized. Intervertebral range of motion, interpedicular travel, and interpedicular displacement metrics were evaluated from 3rd-cycle data using an optoelectric tracking system. Results. Statistically significant decreases in ROM compared to Intact and Destabilized conditions were detected for the instrumented conditions during flexion extension and lateral bending. AT ROM was significantly less than Destabilized but not the Intact condition. Similar trends were found for interpedicular displacement in all modes of loading; however, interpedicular travel trends were less consistent. More importantly, no metrics under any mode of loading revealed significant differences between Dynesys, PEEK, and Titanium. Conclusion. The results of this study support previous findings that Dynesys and PEEK constructs behave similarly to a Titanium rod in vitro. |
| format | Article |
| id | doaj-art-ba43c528ee854fe2b5b093e84a3be8da |
| institution | OA Journals |
| issn | 2090-3464 2090-3472 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Orthopedics |
| spelling | doaj-art-ba43c528ee854fe2b5b093e84a3be8da2025-08-20T02:19:25ZengWileyAdvances in Orthopedics2090-34642090-34722015-01-01201510.1155/2015/895931895931In Vitro Comparison of Dynesys, PEEK, and Titanium Constructs in the Lumbar SpineMatthew S. Yeager0Daniel J. Cook1Boyle C. Cheng2Department of Neurosurgery, Allegheny Health Network, Pittsburgh, PA 15212, USADepartment of Neurosurgery, Allegheny Health Network, Pittsburgh, PA 15212, USADepartment of Neurosurgery, Allegheny Health Network, Pittsburgh, PA 15212, USAIntroduction. Pedicle based posterior dynamic stabilization systems aim to stabilize the pathologic spine while also allowing sufficient motion to mitigate adjacent level effects. Two flexible constructs that have been proposed to act in such a manner, the Dynesys Dynamic Stabilization System and PEEK rod, have yet to be directly compared in vitro to a rigid Titanium rod. Methods. Human lumbar specimens were tested in flexion extension, lateral bending, and axial torsion to evaluate the following conditions at L4-L5: Intact, Dynesys, PEEK rod, Titanium rod, and Destabilized. Intervertebral range of motion, interpedicular travel, and interpedicular displacement metrics were evaluated from 3rd-cycle data using an optoelectric tracking system. Results. Statistically significant decreases in ROM compared to Intact and Destabilized conditions were detected for the instrumented conditions during flexion extension and lateral bending. AT ROM was significantly less than Destabilized but not the Intact condition. Similar trends were found for interpedicular displacement in all modes of loading; however, interpedicular travel trends were less consistent. More importantly, no metrics under any mode of loading revealed significant differences between Dynesys, PEEK, and Titanium. Conclusion. The results of this study support previous findings that Dynesys and PEEK constructs behave similarly to a Titanium rod in vitro.http://dx.doi.org/10.1155/2015/895931 |
| spellingShingle | Matthew S. Yeager Daniel J. Cook Boyle C. Cheng In Vitro Comparison of Dynesys, PEEK, and Titanium Constructs in the Lumbar Spine Advances in Orthopedics |
| title | In Vitro Comparison of Dynesys, PEEK, and Titanium Constructs in the Lumbar Spine |
| title_full | In Vitro Comparison of Dynesys, PEEK, and Titanium Constructs in the Lumbar Spine |
| title_fullStr | In Vitro Comparison of Dynesys, PEEK, and Titanium Constructs in the Lumbar Spine |
| title_full_unstemmed | In Vitro Comparison of Dynesys, PEEK, and Titanium Constructs in the Lumbar Spine |
| title_short | In Vitro Comparison of Dynesys, PEEK, and Titanium Constructs in the Lumbar Spine |
| title_sort | in vitro comparison of dynesys peek and titanium constructs in the lumbar spine |
| url | http://dx.doi.org/10.1155/2015/895931 |
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