Article

Good suspension lessens the pistoning (vertical displacement) of the
residual limb inside the prosthetic socket. Several methods are used for
measuring the pistoning. OBJECTIVES: To introduce
and evaluate a new simple method for measuring the pistoning between the soft
liner and socket in transtibial prostheses. METHODS: Five transtibial prostheses
with Iceross silicone liner and shuttle lock were made for the subjects. The
pistoning was measured between the liner and socket by a photographic method in
single limb support on the prosthetic limb (full weight bearing), non-weight
bearing and under three static axial loading conditions (30, 60 and 90 N).
RESULTS: This new method enabled us to measure the pistoning between the liner
and prosthetic socket. The reproducibility of measurements in different trials of
one session and between two sessions by two observers was shown to be high. The
average of displacement between the liner and socket was about 9 mm in non-weight
bearing compared with full weight bearing. Furthermore, as we expected, the
average of pistoning increased consistently by adding the loads. CONCLUSIONS:
This new method provides for easy and inexpensive determination of pistoning
between the liner and socket by every prosthetist in clinical settings.

Langue : ANGLAIS