Article

OBJECTIVE: To determine whether a powered ankle-foot prosthesis improves gait
mechanics, physical performance, and user satisfaction after traumatic
transtibial amputation. DESIGN: Pre-post. SETTING:
Gait analysis laboratory.
PARTICIPANTS: Young individuals with traumatic transtibial amputation (n=11)
and matched controls (n=11). INTERVENTIONS: Wearing an energy-storing and -returning
(ESR) foot and a powered ankle-foot prosthesis. MAIN OUTCOME MEASURES: Gait
mechanics, physical performance, and user satisfaction. RESULTS: The powered
prosthesis ankle range of motion (ROM) was significantly larger ( approximately
30%) than that of the ESR limb. However, both devices demonstrated significantly
less ankle ROM than the control and intact limbs. At preswing, the ESR limb
generated approximately 40% less peak ankle power than control and intact limbs.
In contrast, the powered prosthesis generated significantly greater peak ankle
power than control (35%) and ESR ( approximately 125%) limbs, resulting in the
powered limb absorbing twice the peak knee power observed in the control and
intact limbs. The powered prosthesis limb peak hip power generation was
approximately 45% greater at preswing than that of the intact limb. Walking
velocity increased with the powered prosthesis compared with the ESR limb and was
greater than that of the control group. However, physical performance measures
were not significantly different between ESR and powered conditions. User
satisfaction scores indicated a preference for the powered prosthesis over the
ESR limb. CONCLUSIONS: Compensatory strategies during gait with the ESR and
powered prosthetic devices were similar to those reported in the literature.
However, the addition of ankle power and ROM by the powered prosthesis appeared
to increase compensatory strategies at proximal joints.
CI - Copyright (c) 2012 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS