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Magnification error of digital x rays on the computer screen.

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    Acetate templates used for pre-operative templating of total hip and knee replacements are unreliable on digital X-rays. The study found significant magnification errors, indicating this method is not accurate for surgical planning with digital imaging systems.

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    Area of Science:

    • Orthopedic Surgery
    • Medical Imaging
    • Radiology

    Background:

    • Pre-operative templating of total hip and knee replacements is crucial for surgical planning.
    • Traditional templating uses acetate overlays on hard-copy X-rays.
    • Transition to digital X-rays necessitates evaluating existing templating methods.

    Purpose of the Study:

    • To assess the accuracy of acetate templates for pre-operative templating on digital X-rays.
    • To evaluate magnification errors when using acetate templates with Picture Archiving and Communication System (PACS) software.

    Main Methods:

    • Retrospective study analyzing 19 total hip and 30 total knee replacement X-rays.
    • Magnification assessed using acetate templates overlaid on digital images displayed via PACS.
    • Acetabular cup diameter measured using digital scales for comparison.

    Main Results:

    • Mean magnification was 0.59 for hip implants (acetabular cup, femoral stem) and 0.48 for knee implants (femoral, tibial).
    • Mean difference in acetabular cup diameter showed an excess of 10.21 mm compared to actual size.
    • Digital X-rays templated with acetate overlays demonstrated significant over-magnification.

    Conclusions:

    • Acetate templates are not reliable for pre-operative templating of total hip and knee replacements on digital X-rays.
    • Magnification inaccuracies suggest that current templating methods using acetate overlays on PACS are not suitable for digital surgical planning.