Cortical Margining Capabilities of Fins Associated with Ventral Cervical Spine Instrumentation
Yonsei Medical Journal
;
: 372-378, 2005.
Article
in English
| WPRIM
| ID: wpr-74460
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.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Spinal Fusion
/
Thoracic Vertebrae
/
Bone Plates
/
Bone Screws
/
In Vitro Techniques
/
Weight-Bearing
Limits:
Humans
Language:
English
Journal:
Yonsei Medical Journal
Year:
2005
Type:
Article
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