Article

During stair ascent (STA) persons with transtibial amputation (TTA) typically
adopt a hip strategy to compensate for the limited ankle motion and joint power
that is characteristic of conventional energy storing and returning (ESR)
prosthetic feet. The purpose of this investigation was to determine if providing
ankle power via a powered prosthetic device (BiOM) normalized STA kinematics and
kinetics. Eleven individuals with TTA participated in two STA gait analysis
sessions: (1) using an ESR foot, and (2) using the BiOM. Eleven height and weight
matched able-bodied controls (CONT) were also assessed. Lower extremity peak
kinematic and kinetic values were calculated at a self-selected and controlled
cadence (80 steps/min). Increased prosthetic limb peak ankle plantarflexion and
push-up power were observed while using the BiOM as compared to ESR. Peak ankle
power was not significantly different between BiOM and CONT indicating
normalization of ankle power generation. However, peak ankle plantarflexion was
significantly lower than CONT. Limb asymmetries including greater prosthetic limb
hip flexion and power during stance, and decreased prosthetic limb knee power
during stance were observed in the BiOM and ESR conditions. The results suggest
that the BiOM successfully increased ankle motion and restored ankle power during
STA. These differences did not, however, reduce the use of a hip strategy while
ascending stairs. Additional device specific training may be necessary to utilize
the full benefits of the device.
CI - Published by Elsevier B.V.

Langue : ANGLAIS