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dc.contributor.authorDe Asha, Alan R.*
dc.contributor.authorMunjal, R.*
dc.contributor.authorKulkarni, J.*
dc.contributor.authorBuckley, John*
dc.date.accessioned2016-04-28T09:33:56Z
dc.date.available2016-04-28T09:33:56Z
dc.date.issued2014-08
dc.identifier.citationDe Asha AR, Munjal R, Kulkarni J and Buckley JG (2014) Impact on the biomechanics of overground gait of using an ‘Echelon’ hydraulic ankle–foot device in unilateral trans-tibial and trans-femoral amputees. Clinical Biomechanics. 29(7): 728-734.en_US
dc.identifier.urihttp://hdl.handle.net/10454/8223
dc.descriptionYesen_US
dc.description.abstractIf a prosthetic foot creates resistance to forwards shank rotation as it deforms during loading, it will exert a braking effect on centre of mass progression. The present study determines whether the centre of mass braking effect exerted by an amputee's habitual rigid ‘ankle’ foot was reduced when they switched to using an ‘Echelon’ hydraulic ankle–foot device. Nineteen lower limb amputees (eight trans-femoral, eleven trans-tibial) walked overground using their habitual dynamic-response foot with rigid ‘ankle’ or ‘Echelon’ hydraulic ankle–foot device. Analysis determined changes in how the centre of mass was transferred onto and above the prosthetic-foot, freely chosen walking speed, and spatio-temporal parameters of gait. When using the hydraulic device both groups had a smoother/more rapid progression of the centre of pressure beneath the prosthetic hindfoot (p ≤ 0.001), and a smaller reduction in centre of mass velocity during prosthetic-stance (p < 0.001). As a result freely chosen walking speed was higher in both groups when using the device (p ≤ 0.005). In both groups stance and swing times and cadence were unaffected by foot condition whereas step length tended (p < 0.07) to increase bilaterally when using the hydraulic device. Effect size differences between foot types were comparable across groups. Use of a hydraulic ankle–foot device reduced the foot's braking effect for both amputee groups. Findings suggest that attenuation of the braking effect from the foot in early stance may be more important to prosthetic-foot function than its ability to return energy in late stance.en_US
dc.language.isoenen_US
dc.rights© 2014 The Authors. This is an open access article under the CC-BY license (http://creativecommons.org/licenses/by/3.0/).en_US
dc.subjectAmputee; Gait; Prosthesis; Trans-femoral; Trans-tibial; Walking speed; ‘Echelon’ hydraulic ankle-footen_US
dc.titleImpact on the biomechanics of overground gait of using an ‘Echelon’ hydraulic ankle–foot device in unilateral trans-tibial and trans-femoral amputeesen_US
dc.status.refereedYesen_US
dc.date.Accepted2014-06-16
dc.date.application2014-06-23
dc.typeArticleen_US
dc.type.versionPublished version paperen_US
dc.identifier.doihttps://doi.org/10.1016/j.clinbiomech.2014.06.009
refterms.dateFOA2018-07-25T14:23:23Z


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