Article

We present a new methodology to measure the running biomechanics of amputees.
This methodology combines the use of a spring-mass model and symmetry index, two
standard techniques in biomechanics literature, but not yet used in concert to
evaluate amputee biomechanics. The methodology was examined in the context of a
pilot study to examine two transtibial amputee sprinters and showed
biomechanically quantifiable changes for small adjustments in prosthetic
prescription. Vertical ground reaction forces were measured in several trials for
two transtibial amputees running at constant speed. A spring-mass model was used
in conjunction with a symmetry index to observe the effect of varying prosthetic
height and stiffness on running biomechanics. All spring-mass variables were
significantly affected by changes in prosthetic prescription among the two
subjects tested (p < 0.05). When prosthetic height was changed, both subjects
showed significant differences, in Deltay(max), Deltal and contact time (t(c)) on
the prosthetic limb and in k(vert) and k(leg) on the sound limb. The symmetry
indices calculated for spring-mass variables were all significantly affected due
to changes in prosthetic prescription for the male subject and all but the peak
force (F(peak)) for the female subject. This methodology is a straight-forward
tool for evaluating the effect of changes to prosthetic prescription.

Langue : ANGLAIS