Otto Bock 3R93, Instructions For Use Manual

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1 To make the load line visible, the transfemoral amputee (with shoes) stands on the L.A.S.A.R.
Posture with the prosthetic side on the force plate and with the other leg on the height com-
pensation panel. The prosthetic side should be sufficiently loaded (> 35% of the body weight).
2 Now adapt the alignment by only adjusting the plantar flexion so that the load line (laser line)
is
40 mm
anterior to the alignment reference point (= knee axis) (see Fig. 9).
4.1.3 Dynamic Alignment Optimization
Perform dynamic optimisation during trial walking. Often, the following aspects have to be ob-
served and adapted, if necessary:
• Socket flexion position by verifying step length symmetry (sagittal plane)
• Adduction position of the socket and M-L positioning of the socket adapter (frontal plane)
• Rotation position of the knee axis and outward rotation of the prosthetic foot (transversal plane)
Finally, document the fitting result using for example the “Dartfish” motion analysis software.
4.2 Adjustments and Final Assembly
CAUTION
Risk of pinching.
When adjusting and assembling the knee joint, there is a risk of pinching in
the flexion range area of the knee joint. Do not reach into the flexion range area.
CAUTION
Risk of falling during trial walking.
For safety reasons, the first steps of the prosthesis wearer
should always be taken between parallel bars.
4.2.1 Deactivating/Activating the Locking Function
CAUTION
Risk of falling.
It is very important to inform the patient about the changed functionality of the
knee joint after deactivating the locking function.
Upon delivery, the locking function is permanently activated. Similar to conventional knee joints
with lock it can be manually released with the pull cable (Fig. 2, item E), e.g. for sitting down.
Deactivating the locking function (permanently)
1. Using a screwdriver, carefully remove the blue-silver 4G551 Cover Cap which is located on
the joint‘s left side (in walking direction) (Fig. 4, item A).
2. Fully extend the knee joint.
3. Unscrew the 506G3=M4x16 Set Screw (Fig. 5, item A) using 710H10=2X3 Adjustment Wrench
(Fig. 5, item B).
4. Apply 636K13 Loctite® to the 506G3=M4X16 Set Screw and – while simultaneously pulling
the cable (Fig. 5, item C) – use 710H10=2X3 Adjustment Wrench to clockwise screw in the
screw up to the stop. The 4G539 Latch (Fig. 5, item D) can then no longer engage in its original
position after letting go of the cable.
5. Reattach the cover cap.
Now the locking function is permanently deactivated. The lock does no longer engage when the
joint reaches full extension. Stance phase stability is now provided by the brake mechanism.