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You have to hold the socket onto the stump firmly, so
that when you walk you do not get what is called 'pistoning', which
is where the stump moves up and down inside the socket. Initially
with an above-the-knee socket you will use a Tess belt which is made
of a fabric belt that has silicon lining around the socket to keep
it in place. (You can see this in the Learning to walk
section)
Once the stump has had time to settle and change shape, you can
proceed to devices like the Silicon Liner, which fits over the stump
and when pushed into the socket creates a vacuum retention using the
seal at the bottom. The silicon is about 6mm thick and can be quite
warm to wear and skin care becomes a priority.
Another method is to have a new socket made that is a snug fit on
the stump and this has a bung in the bottom to allow the air to flow
out as the leg is put on. Once in place the bung is fitted and this
creates the vacuum retention to hold things in place. |