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Procedure
Ordering a custom liner
3.2 Plaster cast
INFORMATION
► Fabricating the plaster cast: Total surface weight-bearing socket, "Harmony" principle
► Shaping the plaster model: Length reduction 5 mm to 8 mm; global circumference reduction: 4%
3.2.1 Preparing the Plaster Cast
Objective
The liner fit is checked to prepare for the plaster cast. Residual limb dimensions can then be measured and critical
structures on the residual limb marked to facilitate modelling.
Required tools and materials
•
Grease pen, measuring devices, measurement sheet (see appendices), plastic film, 99B25 nylon stockinette
6 | Ottobock
Custom liners are custom-produced for the user. This
allows them to meet specific requirements and be
appropriate for all residual limb shapes.
•
Determine the necessary measurements on the
patient and fill out the order form for the desired
custom liner (see Page 31).
•
Take a plaster cast according to the specifications
in the order form.
Roll the liner over the residual limb.
Check the fit.
Work out any air bubbles.
Position the residual limb such that the flexion angle is
approx. 10°.
Determine and document the necessary dimensions
according to your own company's specifications.
Isolate the liner with plastic film up to 5 cm below the
edge without changing the shape of the residual limb.
The non-isolated part of the liner supports the connec
tion between the liner and latex casting bag.
Harmony System
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