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Navicular bone position determined by positional MRI: a reproducibility study.

Philip Hansen1, Finn E Johannsen2, Stine Hangaard3

  • 1Department of Radiology, Copenhagen University Hospital Frederiksberg & Bispebjerg, Nordre Fasanvej 57, Vej 4, Indgang 5, DK-2000, Frederiksberg, Denmark. hansen_philip@hotmail.com.

Skeletal Radiology
|October 30, 2015
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Summary

Positional MRI (pMRI) reliably measures navicular bone height (NVH) and medial navicular position (MNP) within and between observers. Between-day measurements show greater variation in the supine position.

Keywords:
AgreementFoot postureNavicular bonePlantar archPositional MRIReliabilityReproducibilityWeight-bearing MRI

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Area of Science:

  • Orthopedics
  • Radiology
  • Medical Imaging

Background:

  • Accurate assessment of foot biomechanics is crucial for diagnosing and managing various foot conditions.
  • The navicular bone's position and height are key indicators of foot posture and arch integrity.
  • Positional MRI (pMRI) offers a non-invasive method for evaluating foot structures in different weight-bearing conditions.

Purpose of the Study:

  • To evaluate the intraobserver, interobserver, and between-day reproducibility of positional MRI (pMRI) for measuring navicular bone height (NVH) and medial navicular position (MNP).
  • To determine the reliability of pMRI measurements in both supine and standing positions.

Main Methods:

  • Ten healthy participants underwent pMRI scans of the foot in both supine and standing positions using a 0.25 T scanner.
  • Two radiologists independently and blindly evaluated the MRI images.
  • Reproducibility was assessed using intraclass correlation coefficients (ICC) and 95% limits of agreement (LOA%).

Main Results:

  • Substantial intraobserver and interobserver reliability (ICC 0.86-0.98) with good agreement (LOA% 4.9-14.7%) was found for both supine and standing positions.
  • Between-day reliability in the standing position was substantial (ICC 0.85-0.92) with adequate agreement (LOA% 8.3-19.8%).
  • Between-day reliability in the supine position showed moderate ICC for NVH (0.72) and slight ICC for MNP (0.39), with less adequate agreement (LOA% 17.7-24.2%).

Conclusions:

  • Positional MRI provides highly reproducible measurements of NVH and MNP within and between observers.
  • Increased measurement variability between days in the supine position was observed.
  • This variation may stem from subtle positional changes or biomechanical factors, suggesting caution when interpreting supine measurements over time.