Article

OBJECTIVE: To analyze mediolateral joint powers at the low back during gait among
persons with and without unilateral transfemoral amputation to better understand
the functional contributions of tissues in and around the low back to altered
lateral trunk movements in this population. DESIGN: Retrospective analysis of
biomechanical gait data. SETTING: Gait laboratory. PARTICIPANTS: Twenty persons
with unilateral transfemoral amputation and 20 uninjured controls (N=40).
INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Net joint powers, and total
generation (+) and absorption (-) energies, at the low back (L5/S1 spinal level)
were analyzed in the frontal plane using inverse dynamics analyses on over-ground
gait data collected at self-selected walking speeds ( approximately 1.3m/s).
RESULTS: Compared with uninjured controls, 4 distinctly larger positive phases of
mediolateral joint power at L5/S1 were evident in persons with transfemoral
amputation, occurring before and after each heel strike. Total generation
energies throughout the gait cycle were also larger (P<.001) among persons with
transfemoral amputation (4.8+/-1.4J) than among uninjured controls (1.3+/-0.7J).
CONCLUSIONS: Larger positive phases of joint power at L5/S1 in the frontal plane
support previous suggestions that persons with transfemoral amputation use a more
active mediolateral trunk movement strategy, although such an active trunk
movement strategy with transfemoral amputation may contribute to higher metabolic
energy expenditures and low back pain risk.
CI - Copyright (c) 2015 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS