Article

A prosthetist makes a conventional socket by wrapping plaster bandage around the
residual limb and using the resulting shell to create a positive model. After he
or she modifies the plaster, it is used to create a laminated socket. Such
sockets are almost perfect cylinders that encapsulate the limb. The bone is
centered in soft, compressible tissue that must move aside before the bone can
push against the socket to transmit force or torque to the prosthesis. In a
compression/release stabilized (CRS) socket, three or more longitudinal
depressions compress and displace tissue between the socket wall and the bone to
reduce lost motion when the bone is moved with respect to the socket. Release
areas between depressions are opened to accommodate displaced tissue. Without
these openings provided, the CRS socket will not function as intended. Often, the
release areas of compression are the struts of a carbon-fiber frame, and the
regions between struts are left open. A frame with openings may be modified by
the prosthetist adding a thin membrane fully surrounding the limb but allowing
the membrane and underlying tissue to enter the release openings. The membrane
may contain electrodes, and it may constitute a roll-on liner that helps suspend
the prosthesis. We introduce three socket designs: transradial, transfemoral, and
transhumeral.

Langue : ANGLAIS