Reliability of the Australian twenty-cent coin as a radiographic scale marker
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Weinrauch, Harrison
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Abstract
Circulating coins represent an inexpensive and ubiquitously available source of radiographic size templating markers. This study was developed to validate the use of the Australian twenty-cent coin as a size marker for the purposes of pre-operative radiographic templating in orthopaedic surgery.
500 Australian twenty-cent coins obtained from general circulation underwent standardized measurement across two diameters (1000 observations) under controlled environmental conditions.
The average coin diameter measurement was 28.456mm. A high degree of size consistency between coin diameter measurements was observed (standard deviation 0.045mm).
The results of this study indicate that size variation due manufacturing tolerance and wear of the Australian twenty-cent coin are insufficient to impact upon the selection of prosthetic implant size when used as a radiographic scale marker. For the purposes of digital templating in clinical practice, we recommend the diameter of the Australian 20-cent coin be approximated to 28.5mm.
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International Journal of Advanced Joint Reconstruction
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2
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1
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Copyright © 2015 P. Weinrauch. This is an open access article distributed under the Creative Commons Attribution-NonCommercial License (CC-BY-NC), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Clinical Sciences not elsewhere classified