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In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
07:43

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Published on: July 2, 2021

Hip joint centre location: an ex vivo study.

Andrea Cereatti1, Marco Donati, Valentina Camomilla

  • 1Department of Human Movement and Sport Sciences, University of Rome Foro Italico, Rome, Italy. acereatti@uniss.it

Journal of Biomechanics
|March 10, 2009
PubMed
Summary

Estimating hip joint center (HJC) position via stereophotogrammetry is prone to errors from soft tissues. The quartic sphere fit (QFS) method with distal markers achieved accuracy better than 10mm, outperforming other approaches.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Motion Analysis

Background:

  • The hip joint center (HJC) is crucial for biomechanical analysis, often modeled as a spherical hinge.
  • Functional HJC estimation using stereophotogrammetry is susceptible to stereophotogrammetric and soft tissue artifact errors.

Purpose of the Study:

  • To evaluate the accuracy of stereophotogrammetry in locating the hip joint center (HJC).
  • To investigate how hip motion amplitude influences HJC location accuracy.

Main Methods:

  • Experiments were conducted on four adult cadavers with implanted cortical pins and skin markers.
  • Two analytical methods, quartic sphere fit (QFS) and symmetrical centre of rotation estimation (SCoRE), were used for HJC determination.
  • Hip joints were rotated through their widest possible range of motion.

Main Results:

  • Analytical methods performed similarly when only stereophotogrammetric errors were considered.
  • In the presence of soft tissue artifacts, HJC errors varied significantly (1.4–38.5 mm) across subjects, methods, and marker clusters.
  • The QFS method and distal marker clusters generally yielded better accuracy, with a mean HJC location accuracy under 10mm.
  • Reduced hip motion amplitude did not improve HJC accuracy, despite decreasing artifact amplitude.

Conclusions:

  • Soft tissue artifacts significantly impact HJC accuracy in stereophotogrammetric analysis.
  • The QFS method with distal markers offers improved HJC localization accuracy compared to other tested approaches.
  • Motion amplitude reduction does not enhance HJC accuracy in the presence of soft tissue artifacts.