Computational method to evaluate ankle postural stiffness with ground reaction forces

Zhiming Ji, Thomas Findley, Hans Chaudhry, Bruce Bukiet

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We examined an existing method for evaluating postural sway based on force-plate technology. Through an improved mathematical model of postural dynamics, we propose a new method, which better evaluated postural sway and, in addition, computed ankle moment and ankle postural stiffness directly from the measured ground reaction forces. An example is detailed that demonstrates the utility of this approach. The proposed method does not involve filtering or numerical integration and considers the platform inclination. Results from normal subjects show a linear relation between the ankle moment and the sway angle during quiet standing.

Original languageEnglish (US)
Pages (from-to)207-214
Number of pages8
JournalJournal of Rehabilitation Research and Development
Issue number2
StatePublished - Mar 2004

All Science Journal Classification (ASJC) codes

  • Rehabilitation


  • Ankle postural stiffness
  • Postural stability
  • Quiet standing


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