PMCCPMCCPMCC

Search tips
Search criteria 

Advanced

 
Logo of jrsocmedLink to Publisher's site
 
J R Soc Med. 1988 July; 81(7): 384–386.
PMCID: PMC1291665

Unacceptable variation in the core diameters of some AO type cancellous screws.

Abstract

This study assesses the variability in core diameter of a series of cancellous screws and its effect on torque strength. Analysis of a series of 107 cancellous screws revealed a wide variation of the core diameters in our sample. Tests to evaluate the effect of this variation showed that torsional strength is directly proportional to the cube of the radius of the core; a 30% reduction in radius resulting in a 70% loss in torsional strength. Conclusions drawn from this experimental data indicate that variability in core dimensions below the recommended specifications is unacceptable in clinical practice.

Full text

Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (761K), or click on a page image below to browse page by page.

Images in this article

Click on the image to see a larger version.

Articles from Journal of the Royal Society of Medicine are provided here courtesy of Royal Society of Medicine Press