Analytical decomposition can help to interpret ankle joint moment-angle relationship

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
Ruoli WangElena M Gutierrez-Farewik

Abstract

Moment-angle relationship (dynamic joint stiffness)--the relationship between changes in joint moment and changes in joint angle--is useful for demonstrating interaction of kinematics and kinetics during gait. However, the individual contributors of dynamic joint stiffness are not well studied and understood, which has thus far limited its clinical application. In this study, ankle dynamic joint stiffness was analyzed and decomposed into three components in thirty able-bodied children during the stance phase of the gait. To verify the accuracy of the decomposition, the sum of decomposed components was compared to stiffness computed from experimental data, and good to very good agreement was found. Component 1, the term associated with changes in ground reaction force moment, was the dominant contribution to ankle dynamic joint stiffness. Retrospective data from eight children with juvenile idiopathic arthritis and idiopathic toe-walking was examined to explore the potential utility of analytical decomposition in pathological gait. Compared to controls, component 1 was the source of highest deviation in both pathological groups. Specifically, ankle dynamic joint stiffness differences can be further identified via two sub-compone...Continue Reading

References

Jan 5, 2000·Developmental Medicine and Child Neurology·D A SalaM L Chu
Nov 13, 2002·Experimental Brain Research·Annabelle CouillandreYvon Brenière
Sep 1, 2004·Journal of Biomechanics·Andrew H HansenKent P Mesplay
Jan 10, 2006·Gait & Posture·Stéphane ArmandFrançois-Xavier Lepoutre
Dec 17, 2008·Physical Therapy in Sport : Official Journal of the Association of Chartered Physiotherapists in Sports Medicine·Ronaldo C GabrielVitor Filipe

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Citations

May 11, 2017·Frontiers in Neuroscience·Farahiyah JasniNoor Azuan Abu Osman

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