Biomechanical Study of Top Screw Pullout in Anterior Scoliosis Instrumentation

Mayo, Andrew E., Adam, Clayton J., Labrom, Robert D., & Askin, Geoffrey N. (2008) Biomechanical Study of Top Screw Pullout in Anterior Scoliosis Instrumentation. In Lenke, Lawrence G. & Hamzaoglu, Azmi (Eds.) 15th International Meeting on Advanced Spine Techniques, 8-11 July, 2008, Hong Kong. (Unpublished)

PDF (888kB)

View at publisher


Failure of the top screw in anterior scoliosis correction is a common problem with rates of 5-15% reported in the literature. Previous biomechanical studies of anterior vertebral body screws have evaluated their resistance to either straight pullout or cephalo-caudad compression forces with different definitions of failure. This study assesses a screw's resistance to a combination of cephalo-caudad compression of the screw heads and a pullout force directed in an arc centred on the screw below with the construct's rod as it's radius. Results of this study would suggest that the distance between the top two screws is the most important factor identified to improve pullout. A cephalad angulation of around 10 degrees is also desirable. Use of a staple may be useful to protect screws from compressive corrective forces.

Impact and interest:

2 citations in Web of Science®
Search Google Scholar™

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

95 since deposited on 04 Feb 2009
1 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 17309
Item Type: Conference Item (Poster)
Refereed: Yes
Keywords: anterior scoliosis correction contructs, anterior thoracoscopic instrumentaton, endoscopic anterior scoliosis correction, screw pullout, idiopathic scoliosis
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2008 (The authors)
Deposited On: 04 Feb 2009 00:35
Last Modified: 10 Aug 2011 15:22

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page