1. Assessment of the Chignon® dynamic ankle–foot orthosis using instrumented gait analysis in hemiparetic adults
- Author
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Bleyenheuft, C., Caty, G., Lejeune, T., and Detrembleur, C.
- Subjects
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ANKLE , *JOINTS (Anatomy) , *LEG , *PERONEAL tendons - Abstract
Abstract: Objective: In the hemiplegic adult, gait is frequently perturbed by lack of ankle dorsiflexion at toe-off and may prompt prescription of an ankle–foot orthosis (AFO). Our objective was to evaluate the effect on gait of a dynamic AFO (the Chignon® orthosis) in comparison with a prefabricated AFO (PAFO). Method: Ten chronic hemiplegic patients performed a 10m gait test and then underwent an instrumented treadmill gait test under three different sets of conditions (without an orthosis, with a PAFO and with a Chignon® orthosis). The energy cost was calculated by measuring the oxygen consumption during gait. Results: The patients’ free-walking speed was higher with the Chignon® orthosis (0.81±0.25ms−1) than without it (0.64±0.25ms−1; p <0.001). The ankle''s segmental kinematics were better with the Chignon® orthosis than without an orthosis, notably in terms of ankle position at heel strike (−0.8°±4.6 versus −7.9°±8.3; p =0.009) and ankle dorsiflexion at toe-off (1.7°±4.6 versus −5.5°±7.2; p =0.006). External mechanical work was lower with both the PAFO (0.61±0.2Jkg−1 m−1) and the Chignon® orthosis (0.61±0.23Jkg−1 m−1), relative to gait without an orthosis (0.73±0.25Jkg−1 m−1; p =0.003). Total mechanical work was also lower with the PAFO (0.9±0.25Jkg−1 m−1) and the Chignon® orthosis (0.87±0.25Jkg−1 m−1), relative to gait without an orthosis (1.09±0.37Jkg−1 m−1; p =0.001), whereas the reduction in energy cost with orthosis use was borderline-significant (p =0.06). Conclusion: Mechanical work was similarly improved by the two orthoses. The Chignon® orthosis improved the free-walking speed and the ankle''s segmental kinematics. [Copyright &y& Elsevier]
- Published
- 2008
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