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Inaccuracies in the Use of Magnification Markers in Digital Hip Radiographs.

Michael J Archibeck1,2, Tamara Cummins3, Krishna R Tripuraneni3

  • 1New Mexico Orthopaedics, Albuquerque, NM, USA. archibeckmj@nmortho.net.

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Summary

Digital templating for hip arthroplasty is common, but magnification markers are inaccurate. Assuming 20% magnification is more precise than using markers, improving preoperative planning accuracy for total hip arthroplasty.

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Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Medical Imaging

Background:

  • Digital radiographs and templating are standard in hip arthroplasty.
  • The accuracy of magnification markers in digital hip radiographs has not been definitively established.

Purpose of the Study:

  • To assess the accuracy of magnification markers in estimating true hip magnification.
  • To compare marker accuracy against assuming a fixed 20% magnification for preoperative planning.

Main Methods:

  • 100 AP pelvis radiographs with total hip arthroplasty (THA) prostheses and magnification markers were analyzed.
  • Magnification was calculated using both the marker and known femoral head size (true magnification) via OrthoView software.

Main Results:

  • Magnification markers underestimated true magnification by a mean of 6% (95% CI: 6%–7%).
  • Assuming 20% magnification was more accurate than using markers, with 64% of cases within 2% error compared to only 20% using markers.

Conclusions:

  • Magnification markers are generally inaccurate for preoperative templating in hip arthroplasty.
  • Assuming a 20% magnification in software is a more accurate and potentially simpler method for digital hip radiographs.