A comparison of stress-induced porosity due to conventional and a modified spinal fixation device

Tae Hong Lim*, Vijay K. Goel, John M. Winterbottom, Brett Kessler, Jae Y. Ahn, Jong K. Gwon, Joon B. Park, James Neil Weinstein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

A hypothesis that device-related osteopenia can be reduced by decreasing the rigidity of a fixation device was tested through a canine study. Polymer washers were interposed between the integral nut and plate of the variable spinal plating (VSP) system to reduce its rigidity. A solid fusion was observed 6 months postoperatively in all of the animals using VSP or modified systems. The stabilized segment using both systems showed similar load-displacement behaviors immediately after surgery and 6 months postoperatively. Although not significant, 5.6 and 1.8% decreases in volumetric density of mineralized bone were found in the stabilized segments due to VSP and modified systems, respectively. The modified system also increased bone growth around screws. The new concept of using polymer washers, to decrease rigidity of the fixation device over time, may reduce device-related osteopenia.

Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalJournal of Spinal Disorders
Volume7
Issue number1
DOIs
StatePublished - Jan 1 1994

Keywords

  • Biomechanics
  • Canine model
  • Polymer washers
  • Stress-induced osteopenia
  • Variable spinal plating system

ASJC Scopus subject areas

  • Surgery
  • Clinical Neurology

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