Dynamic Alignment Optimisation; Flexion Stop - Otto Bock C-Leg 3C98-3 Instructions For Use Manual

Preparation for use

7.1.7 Dynamic alignment optimisation

After adjusting the product with the adjustment software, perform dynamic optimisation during trial walking. Often,
the following aspects have to be observed 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 joint axis and outward rotation of the prosthetic foot (transversal plane)
At the end of the dynamic alignment optimisation, calibration must be performed using the adjustment software.

7.1.8 Flexion stop

The knee joint comes fitted with a flexion stop upon delivery. This reduces the maximum flexion angle by 8°, thus
preventing the socket from coming into contact with the hydraulic unit.
To limit the flexion angle, the knee joint can be equipped with the following flexion stops:
• 4H95 flexion stop (already installed): reduction of the maximum flexion angle by 8°
• 4H106 flexion stop (optional accessory): reduction of the maximum flexion angle by 16°
The flexion stop can be removed to increase the flexion angle. In this case, it must be ensured that the socket and
the hydraulic unit do not collide (see Page 23).
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To determine the load line, have the patient (with shoes) stand on
the force measurement plate with the prosthesis side and on the
height compensation plate with the other leg.
The prosthesis side must be sufficiently loaded (> 35% body
weight). Note the weight display on the L.A.S.A.R. Posture.
Optimise the alignment solely by changing the plantar flexion.
Only make adjustments to the distal and proximal set screws of
the socket adapter on the prosthetic foot, so that the load line
(laser line) runs approx. 30 mm/1.18 inch in front of the align­
ment reference point (= knee axis) of the knee joint.
Removing the flexion stop
1) Use an appropriate screwdriver to loosen the screws on both flexion stops (left
and right of the piston rod).
2) Remove both flexion stops from the joint together with the screws.
INFORMATION: Do not insert screws without flexion stops!
Inserting the flexion stop
1) Insert both flexion stops (to the left and right of the piston rod).
2) Secure the screws with 636K13 thread lock.
3) Insert the screws.
4) Tighten the screws to 1 Nm with the 710D1 torque wrench.
C-Leg 3C98-3/3C88-3