Scaling digital radiographs for templating in total hip arthroplasty using conventional acetate templates independent of calibration markers

Brew, Christopher J., Simpson, Philip M., Whitehouse, Sarah L., Donnelly, Bill, Crawford, Ross W., & Hubble, Matthew J.W. (2011) Scaling digital radiographs for templating in total hip arthroplasty using conventional acetate templates independent of calibration markers. Journal of Arthroplasty, 27(4), pp. 643-647.

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We describe a scaling method for templating digital radiographs using conventional acetate templates independent of template magnification without the need for a calibration marker.

The mean magnification factor for the radiology department was determined (119.8%, range117%-123.4%). This fixed magnification factor was used to scale the radiographs by the method described. 32 femoral heads on postoperative THR radiographs were then measured and compared to the actual size. The mean absolute accuracy was within 0.5% of actual head size (range 0 to 3%) with a mean absolute difference of 0.16mm (range 0-1mm, SD 0.26mm).

Intraclass Correlation Coefficient (ICC) showed excellent reliability for both inter and intraobserver measurements with ICC scores of 0.993 (95% CI 0.988-0.996) for interobserver measurements and intraobserver measurements ranging between 0.990-0.993 (95% CI 0.980-0.997).

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ID Code: 46494
Item Type: Journal Article
Refereed: Yes
Keywords: Total hip arthroplasty, digital radiograph templating
DOI: 10.1016/j.arth.2011.08.002
ISSN: 0883-5403
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CLINICAL SCIENCES (110300) > Orthopaedics (110314)
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 2011 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in Journal of Arthroplasty. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Arthroplasty, [VOL27, ISSUE4 (2011)] DOI: 10.1016/j.arth.2011.08.002
Deposited On: 16 Oct 2011 22:42
Last Modified: 30 Mar 2012 14:37

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