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Annals of Biomedical Engineering

, Volume 44, Issue 7, pp 2168–2180 | Cite as

Accuracy of Functional and Predictive Methods to Calculate the Hip Joint Center in Young Non-pathologic Asymptomatic Adults with Dual Fluoroscopy as a Reference Standard

  • Niccolo M. Fiorentino
  • Michael J. Kutschke
  • Penny R. Atkins
  • K. Bo Foreman
  • Ashley L. Kapron
  • Andrew E. AndersonEmail author
Article

Abstract

Predictions from biomechanical models of gait may be sensitive to joint center locations. Most often, the hip joint center (HJC) is derived from locations of reflective markers adhered to the skin. Here, predictive techniques use regression equations of pelvic anatomy to estimate the HJC, whereas functional methods track motion of markers placed at the pelvis and femur during a coordinated motion. Skin motion artifact may introduce errors in the estimate of HJC for both techniques. Quantifying the accuracy of these methods is an area of open investigation. In this study, we used dual fluoroscopy (DF) (a dynamic X-ray imaging technique) and three-dimensional reconstructions from computed tomography images, to measure HJC locations in vivo. Using dual fluoroscopy as the reference standard, we then assessed the accuracy of three predictive and two functional methods. Eleven non-pathologic subjects were imaged with DF and reflective skin marker motion capture. Additionally, DF-based solutions generated virtual markers placed on bony landmarks, which were input to the predictive and functional methods to determine if estimates of the HJC improved. Using skin markers, functional methods had better mean agreement with the HJC measured by DF (11.0 ± 3.3 mm) than predictive methods (18.1 ± 9.5 mm); estimates from functional and predictive methods improved when using the DF-based solutions (1.3 ± 0.9 and 17.5 ± 8.6 mm, respectively). The Harrington method was the best predictive technique using both skin markers (13.2 ± 6.5 mm) and DF-based solutions (10.6 ± 2.5 mm). The two functional methods had similar accuracy using skin makers (11.1 ± 3.6 and 10.8 ± 3.2 mm) and DF-based solutions (1.2 ± 0.8 and 1.4 ± 1.0 mm). Overall, functional methods were superior to predictive methods for HJC estimation. However, the improvements observed when using the DF-based solutions suggest that skin motion artifact is a large source of error for the functional methods.

Keywords

Arthrokinematics Gait analysis Motion capture Hip joint center In vivo 

Notes

Acknowledgments

The authors acknowledge financial support from the National Institutes of Health (NIH-R21AR063844, F32AR067075, S10RR026565) and the LS Peery Discovery Program in Musculoskeletal Restoration. The research content herein is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health or LS-Peery Foundation. The authors also acknowledge the contributions of Madeline Singer, Justine Goebel, Tyler Skinner, Michael Austin West and Christopher Aronitz.

Conflict of interest

The corresponding author and co-authors do not have a conflict of interest, financial or otherwise, that would inappropriately influence or bias the research reported herein.

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Copyright information

© Biomedical Engineering Society 2015

Authors and Affiliations

  • Niccolo M. Fiorentino
    • 1
  • Michael J. Kutschke
    • 1
  • Penny R. Atkins
    • 1
    • 2
  • K. Bo Foreman
    • 1
    • 3
  • Ashley L. Kapron
    • 1
  • Andrew E. Anderson
    • 1
    • 2
    • 3
    • 4
    Email author
  1. 1.Department of OrthopaedicsUniversity of UtahSalt Lake CityUSA
  2. 2.Department of BioengineeringUniversity of UtahSalt Lake CityUSA
  3. 3.Department of Physical TherapyUniversity of UtahSalt Lake CityUSA
  4. 4.Scientific Computing and Imaging InstituteSalt Lake CityUSA

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