TF Prosthetic Components and Suspension Systems (2) Flashcards
stance control components should
use alignment as a means of increase or decrease stance control
types of stance components
polycentric knee
friction lock
manual lock
polycentric knee
axis is posterior
creates extension moment –> stability
frictional lock
locking produced by two surfaces mating when weight is borne on the knee
frictional lock –> wedge type
will prevent buckling of knee if knee is inadvertently flexed 20-25 degrees
the frictional lock doesnt
impede swing
advantage of frictional locks
increased stability
good for pts w/ weak mm
manual lock provides
max stability in stance
when does the manual lock lock
when pt stands, must manually unlock for sitting
manual lock advtantage
stable and simple
manual lock disadvantage
ambulation w/ locked knee
increase energy
poor cosmesis
purpose of extension aides
to assist in forward swing of the shank
prevent excessive heel rise
helpful taking short steps
micropressor knees
on board computer controls hydraulic fluid flow and adjusts channel widths
example of micropressor knee
rheo knee
ossur
C-leg - ottoboch
c-leg - ottoboch
adjusts to forces at the knee during swing and stance
makes 50 adjustments/second during gait cycle
c-leg - ottoboch battery life
25-30 hrs
suspension
suction
candidates for suction suspension
good residual limb shape/mm
good skin integrity
pressure tolerant skin
suction suspension is
total contact
what does suction suspension have
1-way valve air expelled in stance
may vary
suction w/ auxiliary support
what doesnt the suction suspension have
external straps
prosthetic sock
what holds the prosthesis on–> suction suspension
negative pressure
what is used to pull RL into socket –> suction suspension
donning aide
can use lubricant to slide in
advantages of suction suspension
no straps or belts
improved comfort and cosmesis
greater freedom of motion
increase use of remaining mm d/t more intimate and anatomical fit
decrease pistoning in socket
feels more attached/secure
