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Related Experiment Video

Updated: May 11, 2026

Clinical-oriented Three-dimensional Gait Analysis Method for Evaluating Gait Disorder
06:54

Clinical-oriented Three-dimensional Gait Analysis Method for Evaluating Gait Disorder

Published on: March 4, 2018

Tripod index: a new radiographic parameter assessing foot alignment.

Marut Arunakul1, Annunziato Amendola, Yubo Gao

  • 1Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, Iowa, USA.

Foot & Ankle International
|May 10, 2013
PubMed
Summary

The new Tripod Index (TI) reliably assesses complex foot deformities like flatfoot and cavovarus foot. This radiographic measurement correlates well with existing parameters, aiding clinical evaluation.

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Area of Science:

  • Orthopedic surgery
  • Radiology
  • Biomechanical analysis

Background:

  • Existing radiographic measurements do not fully capture complete foot alignment.
  • The Tripod Index (TI) was developed for assessing complex foot deformities using standing AP foot radiographs.

Purpose of the Study:

  • To evaluate the intraobserver and interobserver reliability of the TI.
  • To determine the correlation of the TI with established radiographic parameters in flatfoot and cavovarus foot deformities.

Main Methods:

  • Three patient groups (flatfoot, cavovarus foot, controls) underwent weight-bearing foot AP, lateral, and hindfoot alignment views.
  • Two blinded investigators performed radiographic measurements.
  • Statistical analysis included ICCs, Pearson correlations, and ANOVA.
Keywords:
Tripod Indexcavovarus footflatfootradiographic parameter

Related Experiment Videos

Last Updated: May 11, 2026

Clinical-oriented Three-dimensional Gait Analysis Method for Evaluating Gait Disorder
06:54

Clinical-oriented Three-dimensional Gait Analysis Method for Evaluating Gait Disorder

Published on: March 4, 2018

Main Results:

  • Excellent intraobserver (0.99) and interobserver (0.98) ICCs for TI.
  • Significant correlations between TI and various established parameters in both flatfoot and cavovarus groups.
  • Statistically significant differences in TI and other measurements between deformity groups and controls (P < .001).

Conclusions:

  • The TI is a valid and reliable radiographic measurement for quantifying complex foot deformities.
  • The TI can be a valuable tool for integrated assessment of foot deformities, warranting further clinical study.