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

doi:10.1097/00002517-199407010-00001

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 journal › Article › peer-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 language	English (US)
Pages (from-to)	1-11
Number of pages	11
Journal	Journal of Spinal Disorders
Volume	7
Issue number	1
DOIs	https://doi.org/10.1097/00002517-199407010-00001
State	Published - 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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10.1097/00002517-199407010-00001

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

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.",

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AU - Goel, Vijay K.

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AU - Kessler, Brett

AU - Ahn, Jae Y.

AU - Gwon, Jong K.

AU - Park, Joon B.

AU - Weinstein, James Neil

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N2 - 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.

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KW - Polymer washers

KW - Stress-induced osteopenia

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

Abstract

Keywords

ASJC Scopus subject areas

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