A comparative biomechanical study of spinal fixation using cotrel-dubousset instrumentation

J. P. Farcy, M. Weidenbaum, C. B. Michelsen, D. A. Hoeltzel, K. A. Athanasiou

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

A biomechanical study was performed comparing the stiffness and stability of Cotrel-Dubousset (CD) spinal instrumentation with that of segmentally wired Harrington distraction rods and segmentally wired Luque rods under conditions of single-level instability. The axial and torsional stiffness coefficients of each system were determined on a customized geometric spine simulator fashioned from stainless steel. The relative stability of each instrumentation system on bovine thoracic spines from 12-week-old calves, destabilized by anterior vertebrectomy to create simulated two column instability. Thirteen spines were tested. Each specimen was tested under axial and torsional loading conditions while monitoring with a personal computer-based data acquisition system was performed. The stability of first- and second-level CD instrumentation was tested on the bovine specimens. First-level CD instrumentation involved double-hook fixation one level above an below the level of instability. Second-level CD instrumentation involved fixation two levels above and below the level of instability without fixation at the intermediate level. In axial loading, double-level wired Harrington distraction rods, double-level wired Luque rods, and first-level CD rods were 26.5%, 18.4%, and 21.5%, respectively, as stable as second-level CD instrumentation. In torsion, double-level Harrington, doubel-level Luque, and second-level CD rods were 13%, 64%, and 34%, respectively, as stable as first level CD instrumentation. Locking hooks, double-hook configurations, and stabilizing transverse traction devices of the CD contributed to its greater stability. First-level CD instrumentation is recommended for rotational instability while second-level CD instrumentation is preferred for axial instability.

Original languageEnglish (US)
Pages (from-to)877-881
Number of pages5
JournalSpine
Volume12
Issue number9
StatePublished - 1987
Externally publishedYes

Fingerprint

Spine
Weight-Bearing
Stainless Steel
Microcomputers
Traction
Information Systems
Thorax
Equipment and Supplies

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Orthopedics and Sports Medicine

Cite this

Farcy, J. P., Weidenbaum, M., Michelsen, C. B., Hoeltzel, D. A., & Athanasiou, K. A. (1987). A comparative biomechanical study of spinal fixation using cotrel-dubousset instrumentation. Spine, 12(9), 877-881.

A comparative biomechanical study of spinal fixation using cotrel-dubousset instrumentation. / Farcy, J. P.; Weidenbaum, M.; Michelsen, C. B.; Hoeltzel, D. A.; Athanasiou, K. A.

In: Spine, Vol. 12, No. 9, 1987, p. 877-881.

Research output: Contribution to journalArticle

Farcy, JP, Weidenbaum, M, Michelsen, CB, Hoeltzel, DA & Athanasiou, KA 1987, 'A comparative biomechanical study of spinal fixation using cotrel-dubousset instrumentation', Spine, vol. 12, no. 9, pp. 877-881.
Farcy JP, Weidenbaum M, Michelsen CB, Hoeltzel DA, Athanasiou KA. A comparative biomechanical study of spinal fixation using cotrel-dubousset instrumentation. Spine. 1987;12(9):877-881.
Farcy, J. P. ; Weidenbaum, M. ; Michelsen, C. B. ; Hoeltzel, D. A. ; Athanasiou, K. A. / A comparative biomechanical study of spinal fixation using cotrel-dubousset instrumentation. In: Spine. 1987 ; Vol. 12, No. 9. pp. 877-881.
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