Inaccuracies in the Use of Magnification Markers in Digital Hip Radiographs

Clinical Orthopaedics and Related Research
Michael J ArchibeckRichard E White

Abstract

With the ubiquity of digital radiographs, the use of digital templating for arthroplasty has become commonplace. Although improved accuracy with digital radiographs and magnification markers is assumed, it has not been shown. We wanted to (1) evaluate the accuracy of magnification markers in estimating the magnification of the true hip and (2) determine if the use of magnification markers improves on older techniques of assuming a magnification of 20% for all patients. Between April 2013 and September 2013 we collected 100 AP pelvis radiographs of patients who had a THA prosthesis in situ and a magnification marker placed per the manufacturer's instructions. Radiographs seen during our standard radiographic review process, which met our inclusion criteria (AP pelvic view that included a well-positioned and observed magnification marker, and a prior total hip replacement with a known femoral head size), were included in the analysis. We then used OrthoView(TM) software program to calculate magnification of the radiograph using the magnification marker (measured magnification) and the femoral head of known size (true magnification). The mean true magnification using the femoral head was 21% (SD, 2%). The mean magnification using ...Continue Reading

References

Jun 6, 2009·The Journal of Arthroplasty·Patrick GambleMitchell Winemaker
Jan 14, 2010·Archives of Orthopaedic and Trauma Surgery·Ely Liviu SteinbergShmuel Dekel
Apr 17, 2014·The Journal of Arthroplasty·Victoria F SinclairDavid Knowles

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Citations

Jul 15, 2017·Applied Bionics and Biomechanics·Frederick GreatrexClaudia Mazzà
Jul 4, 2020·Revista Brasileira De Ortopedia·Giancarlo Cavalli PoleselloWalter Ricioli Junior
Nov 26, 2020·AJR. American Journal of Roentgenology·Tania S MannEloy A Fernandes
Feb 23, 2021·The Journal of Arthroplasty·Leonard T BullerDavid J Mayman
Mar 20, 2021·BMC Musculoskeletal Disorders·Jan GessmannHinnerk Baecker
Nov 30, 2021·European Journal of Orthopaedic Surgery & Traumatology : Orthopédie Traumatologie·Mohammad Al-AshqarJames Hahnel

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