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1: Prosthet
Orthot Int. 1997 Dec;21(3):168-74.

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Optimisation of the prescription
for trans-tibial (TT) amputees.

Cortes A, Viosca E,
Hoyos JV, Prat J, Sanchez-Lacuesta J.

Institute of
Biomechanics of Valencia (IBV), Parque Tecnologico de Valencia,
Spain.

The great diversity of prosthetic mechanisms available
nowadays leads to the question of which type of artificial foot would be
the most advisable for a particular person. To answer correctly, it is
necessary to establish, in an objective way, the performance of each
type of prosthetic mechanism. This knowledge is obtained by means of the
study of the subject-prosthesis interaction, both in static and dynamic
conditions. This paper, based on the analysis of 8 trans-tibial (TT)
amputees, presents a quantitative method for the study of human gait
which allows the determination of the influence of four different
prosthetic ankle-foot mechanisms (SACH, Single-axis, Greissinger and
Dynamic) on gait. To do this, 1341 gait trials at different cadences
were analysed (383 with normal subjects and 958 with amputees, using the
four prosthetic feet under study). From all the variables available for
study only those which offered interpretable clinical information were
chosen for analysis. A total of 18 variables (kinetic, kinematic and
time-related) were selected. A covariance analysis (ANOVA) of these
variables was made, which showed that the factors influencing TT amputee
gait were, in order of importance, cadence and leg studied (sound or
prosthetic), inter-individual variability and, finally, the prosthetic
mechanism used. When looking at the performance during gait of the 4
prosthetic mechanisms studied it can be observed that there are
similarities in the kinetic study between SACH and Dynamic feet on one
hand and Single-axis and Greissinger feet on the other. These results
seem to support the classification criteria of articulated and
non-articulated prosthetic mechanisms.

Publication Types:

Clinical Trial

Controlled Clinical Trial

PMID: 9453087 [PubMed -
indexed for MEDLINE]

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