Biomechanical comparison of frontal plane knee joint moment arms during normal and Tai Chi walking

Adam Jagodinsky, John Fox, Brandi Decoux, Wendi Weimar, Wei Liu

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


[Purpose] Medial knee osteoarthritis, a degenerative joint disease, affects adults. The external knee adduction moment, a surrogate knee-loading measure, has clinical implications for knee osteoarthritis patients. Tai Chi is a promising intervention for pain alleviation in knee osteoarthritis; however, the characteristics of external knee adduction moment during Tai Chi have not been established. [Subjects and Methods] During normal and Tai Chi walking, a gait analysis was performed to compare the external knee adduction moment moment-arm characteristics and paired t-tests to compare moment-arm magnitudes. [Results] A significant difference was observed in the average lateral direction of moment-arm magnitude during Tai Chi walking (−0.0239 ± 0.011 m) compared to that during normal walking (−0.0057 ± 0.004 m). No significant difference was found between conditions in average medial direction of moment-arm magnitude (normal walking: 0.0143 ± 0.010 m; Tai Chi walking: 0.0098 ± 0.014 m). [Conclusion] Tai Chi walking produced a larger peak lateral moment-arm value than normal walking during the stance phase, whereas Tai Chi walking and normal walking peak medial moment-arm values were similar, suggesting that medial knee joint loading may be avoided during Tai Chi walking.

Original languageEnglish (US)
Pages (from-to)2959-2961
Number of pages3
JournalJournal of Physical Therapy Science
Issue number9
StatePublished - Sep 30 2015
Externally publishedYes


  • External knee adduction moment arm
  • Tai Chi gait
  • Walking

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation


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