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Different
prosthetic construction are used for fitting
transtibial amputations (also known as below
knee amputations). In general, a distinction
is made between transtibial short-
prostheses and convential prostheses with
thigh sleeve and side joint bars, the latter
having lost importance due to advanced
techniques of residual limb encasement.
Their use has been limited to patients with
short residual limbs, knee injuries,
malfunctions (for example, due to palsies or
false positioning). In many case ,
combination with a tuberosity seat may be
indicated to provide relief.
Short –prostheses, such as constriction and
atrophy of the joint bars, limitation of
knee joint movement, missing full contact,
etc. An important prerequisite for
successful fitting is the accurate
encasement of the residual limb, generally
provided with a plaster model-based contact
socket that covers the condyles. The same
applies to biomechanical alighment.
Great demands are made on the fit and
function of the transtibial socket due to
the small amount of soft tissue - which the
prosthetist may accommodate through the use
of various application techniques and
materials.
Transtibial
Swimming Prosthesis
This type of
prosthesis made of lamination resin is
designed as a water-resistant walking aid.
The pros-thetic shin, with or without soft
liner, is fabricated with a total contact
socket and supracondylar sus-pension.
A special
feature of transtibial short-prostheses is
the removable thigh sleeve (Fig. 122), which
is opened dorsally.
The thigh sleeve
of lamination resin (a) with side mounted
joint bars (b) is connected to the
short-prosthesis
(d) with the below-knee band (c) (Fig. 122).
This construction compensates for lateral
forces exerted during sports or other
activities.
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