Cortical Margining Capabilities of Fins Associated with Ventral Cervical Spine Instrumentation.
10.3349/ymj.2005.46.3.372
- Author:
Byung Ho JIN
1
;
Heum Dai KWON
;
Yong Eun CHO
Author Information
1. Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Korea. bhjin61@yumc.yonsei.ac.kr
- Publication Type:Retracted Publication ; In Vitro ; Original Article
- Keywords:
Biomechanics;
cervical plate;
fins
- MeSH:
*Bone Plates;
Bone Screws;
Humans;
In Vitro;
Spinal Fusion/*instrumentation;
Thoracic Vertebrae/*physiology/*surgery;
*Weight-Bearing
- From:Yonsei Medical Journal
2005;46(3):372-378
- CountryRepublic of Korea
- Language:English
-
Abstract:
Fins incorporated into the design of a dynamic cervical spine implant have been employed to enhance axial load- bearing ability, yet their true biomechanical advantages, if any, have not been defined. Therefore, the goal of this study was to assess the biomechanical and axial load-bearing contributions of the fin components of the DOC ventral cervical stabilization system. Eighteen fresh cadaveric thoracic vertebrae (T1-T3) were obtained. Three test conditions were devised and studied: Condition A (DOC implants with fins were placed against the superior endplate and bone screws were not inserted) ; Condition B (DOC implant without fins was placed and bone screws were inserted) ; and Condition C (DOC implant with fins were placed against the superior endplate and bone screws were inserted). Specimens were tested by applying a pure axial compressive load to the superior platform of the DOC construct, and load-displacement data were collected. Condition C specimens had the greatest stiffness (459 +/- 80N/mm) and yield load (526 +/- 168N). Condition A specimens were the least stiff (266 +/- 53N/mm), and had the smallest yield loads (180 +/- 54N). The yield load of condition A plus condition B was approximately equal to that of condition C, with condition A contributing about one-third and condition B contributing two-thirds of the overall load-bearing capacity. Although the screws alone contributed to a substantial portion of axial load-bearing ability, the addition of the fins further increased load-bearing capabilities.
