Kinematic and biomimetic assessment of a hydraulic ankle/foot in level ground and camber walking
2017
Improved walking comfort has been linked with better bio-mimicking of the prosthetic ankle.
This study investigated if a hydraulic ankle/foot can provide enough motion in both the sagittal
and frontal planes during level and camber walking and if the hydraulic ankle/foot better
mimics the biological ankle moment pattern compared with a fixed ankle/foot device. Five
active male unilateral trans-femoral amputees performed level ground walking at normal
and fast speeds and 2.5E camber walking in both directions using their own prostheses fitted
with an aEchelono hydraulic ankle/foot and an aEsprito fixed ankle/foot. Ankle angles and the
Trend Symmetry Index of the ankle moments were compared between prostheses and
walking conditions. Significant differences between prostheses were found in the stance
plantarflexion and dorsiflexion peaks with a greater range of motion being reached with the
Echelon foot. The Echelon foot also showed significantly improved bio-mimicry of the ankle
resistance moment in all walking conditions, either compared with the intact side of the
same subject or with the anormalo mean curve from non-amputees. During camber walking,
both types of ankle/foot devices showed similar changes in the frontal plane ankle angles.
Results from a questionnaire showed the subjects were more satisfied with Echelon foot.
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