Stability of anterior vertebral body screws after kyphoplasty augmentation : An experimental study to compare anterior vertebral body screw fixation in soft and cured kyphoplasty cement

DOI to cite this document:

10.5283/epub.1210 Copy

Linhardt, O. ; Lüring, C. ; Matussek, J. ; Hamberger, C. ; Herold, T. ; Plitz, W. ; Grifka, J.

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Date of publication of this fulltext: 05 Aug 2009 13:25

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Details

Item type:	Article
Journal or Publication Title:	International orthopaedics
Volume:	30
Number of Issue or Book Chapter:	5
Page Range:	pp. 366-370
Date:	October 2006
Institutions:	Medicine > Lehrstuhl für Röntgendiagnostik
Identification Number:	Value Type 10.1007/s00264-006-0100-4 DOI 16586135 PubMed ID
Dewey Decimal Classification:	600 Technology > 610 Medical sciences Medicine
Status:	Published
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	Unknown
Item ID:	1210

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Abstract

The goal of this cadaver study was to compare the stability of anterior vertebral body screws after implantation in soft or cured kyphoplasty cement. Anterior vertebral body screws were inserted in a total of 30 thoracolumbar vertebrae of ten different human specimens: ten screws were implanted in non-augmented vertebrae (group 1), ten screws were placed in soft cement (group 2), and ten screws ...

Abstract

The goal of this cadaver study was to compare the stability of anterior vertebral body screws after implantation in soft or cured kyphoplasty cement. Anterior vertebral body screws were inserted in a total of 30 thoracolumbar vertebrae of ten different human specimens: ten screws were implanted in non-augmented vertebrae (group 1), ten screws were placed in soft cement (group 2), and ten screws were placed in cured cement (group 3). The screws were then tested for biomechanical axial pullout resistance. Mean axial pullout strength was 192 N (range: 10-430 N) in group 1, 364 N (range: 65-875 N) in group 2, and 271 N (range: 35-625 N) in group 3. The paired Student's t-test demonstrated a significant difference between pullout strength of groups 1 and 2 (p= 0.0475). No significant difference was seen between pullout strength of groups 1 and 3 (p= 0.2646) and between groups 2 and 3 (p= 0.3863). We achieved a 1.9 times higher pullout strength with kyphoplasty augmentation of osteoporotic vertebrae compared with the pullout strength of non-augmented vertebrae. Implantation of anterior vertebral body screws in cured cement is a satisfactory method. With this method we found a 1.4 times higher pullout strength than non-augmented vertebrae.

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