Installing/Removing The Knee Extender - Otto Bock C-Leg 3C98-3 Instructions For Use Manual

Preparing the product for use
marked during plaster cast taking and trial fitting of the check socket) will facilitate correct positioning of the lamin­
ation anchor or socket adapter.

7.1.5 Installing/removing the knee extender

CAUTION
Using the prosthesis on the patient with the knee extender installed
Falling due to unexpected prosthesis behaviour.
► Before trial fitting the prosthesis on the patient, remove the knee extender.
► Do not use the knee joint with the knee extender inserted under any circumstances during dynamic alignment
optimisation.
INFORMATION
Support for using of the knee extender via the adjustment software
When the knee joint is connected to the C-Soft Plus adjustment software, version 1.10 or higher, correct exten­
sion of the knee joint with the help of the knee extender is shown in real time.
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28
Position the middle of the foot (MF) approx. 30 mm/1.18 inch
anterior to the alignment reference line (A). This applies to all
foot components that are recommended for use with the product,
regardless of the previous alignment specifications in the instruc­
tions for use of those feet!
Noting the alignment recommendation of the foot component,
add 5 mm to the effective heel height (shoe heel height – sole
thickness in the forefoot area) and set the outward rotation of the
foot.
Take into account the knee-ground distance and outward rotation
of the knee (the adapter insert provides for a rotation of approx.
5°). Recommended sagittal positioning of the alignment refer­
ence point: 20 mm/0.79 inch above the medial tibial plateau.
Connect the foot and knee joint using a tube adapter. To do so,
tilt the joint to the correct position and set the required tube
length.
Mark the lateral centre of the socket with a centred proximal and
distal dot. Mark a line through both dots from the socket brim to
the end of the socket. Insert the 4H105 knee extender (see
page 28).
Position the socket so the alignment reference line passes
through the centred, proximal dot.
Adjust the socket flexion to 3°–5°, but take the individual situation
(e.g. hip joint contractures) and the ischial tuberosity-to-ground
distance into account.
The adjustment software helps to determine the socket flexion
precisely.
Connect the socket and modular knee joint using an adapter.
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C-Leg 3C98-3/3C88-3