Effect of ankle-foot orthosis on active ankle moment in patients with hemiparesis
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The paper investigates the effect of dorsi/plantar rigidity and the initial angle of ankle-foot orthoses (AFOs) on the moment generated by ankle musculature (referred to as active ankle moment) during gait in patients with hemiparesis. In the early stance phase, the active ankle moment in the direction of dorsiflexion is negligible, and AFOs play an important role in supplementing weak dorsiflexion. In mid to late stance, the moment generated by AFOs is very small compared with the active ankle moment in the direction of plantarflexion. AFOs therefore play only a limited role in assisting plantar flexors during this period. The active ankle moment in the direction of plantarflexion varies significantly with changes in the rigidity and initial angle of AFOs in 11 out of 20 subjects. The implication of this finding is discussed in relation to the need for dynamic matching of AFOs in individual patients with hemiparesis.
KeywordsAnkle-foot orthosis Hemiplegia Ankle moment Fitting
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- Balmaseda, M. T., Koozenkanari, S. H., Fatehi, M. T., Gordon, C., Dreyfuss, P. H. andTanbonliong, E. C. (1988): ‘Ground reaction force, center of pressure, and duration of stance with and without and ankle-foot orthosis’.Arch. Phys. Med. Rehabil.,69, pp. 1009–1012.Google Scholar
- Condie, D. N. andMeadows, B. (1993): ‘Ankle-foot orthoses’ inBowker, P., Condie, D. N., Bader, D. L. andPratt, D. J. (Eds.): ‘Biomechanical basis of orthotic management’ (Butterworth & Heinemann, Oxford) pp. 99–123.Google Scholar
- Lehmann, J. F. (1979): ‘Biomechanics of ankle-foot orthoses: Prescription and design’.Arch. Phys. Med. Rehabil.,60, pp. 200–207.Google Scholar
- Lehmann, J. F., Ko, M. J. andDeLateur, B. J. (1982): ‘Knee moments: Origin in normal ambulation and their modification by double-stopped ankle-foot orthoses’.Arch. Phys. Med. Rehabil.,63, pp. 345–351.Google Scholar
- Lehmann, J. F., Esselman, D. C., Ko, M. J., Smith, J. C., DeLateur, B. J. andDralle, A. J. (1983): ‘Plastic ankle-foot orthoses: Evaluation of function’.Arch. Phys. Med. Rehabil.,64, pp. 402–407.Google Scholar
- Lehmann, J. F., Condon, S. M., Price, R. andDeLateur, B. J. (1987): ‘Gait abnormalities in hemiplegia: Their correction by ankle-foot orthoses’.Arch. Phys. Med. Rehabil.,68, pp. 763–771.Google Scholar
- Miyazaki, S., Yamamoto, S., Ebina, M. andIwasaki, M. (1993): ‘A system for the continuous measurement of ankle joint moment in hemiplegic patient wearing ankle-foot orthoses’.Front. Med. Biol. Eng.,5, pp. 215–232Google Scholar
- New York University Medical Center, Post-Graduate Medical School, Prosthetics andOrthotics (1990): ‘Lower-limb orthotics’, pp. 245–249.Google Scholar
- Spence, W. D., Nicol, A. C., Berme, N. andPaul, J. P. (1979): ‘The assessment of the lower limb residual function of the elderly hemiplegic patient and the corresponding patient orthosis matching’. Final Report to Beth Johnson Foundation, Glasgow, pp. 1–42.Google Scholar
- Yamamoto, S., Ebina, M., Kubo, S., Kawai, H., Hayashi, T., Iwasaki, M., Kubota, T. andMiyazaki, S. (1993b): ‘Quantifications of the effect or dorsi-/plantar flexibility of ankle-foot orthoses on hemiplegic gait: A preliminary report’,J. Prosthet. Orthot.,5, pp. 88–94.Google Scholar