Torque Values Of The Screw Connections; Flexion Stop; Checking The Socket After Bench Alignment - Otto Bock C-Leg 3C98-3 Instructions For Use Manual

• 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.

7.1.7 Torque values of the screw connections

CAUTION
Incorrectly secured screws
Falling due to breakage of load-bearing components caused by screw connections coming loose.
► After completing all settings, the set screws in the tube adapter must be secured before they are tightened to
the specified torque.
► The screws in the clamp bracket must not be secured but only tightened to the specified torque.
Using the 710D4 torque wrench, tighten the corresponding screws in several cycles until the specified torque is
reached.
Screw connection
Tube adapter on prosthetic foot
Clamp bracket on knee joint
Fitting for short residual limb
Rotation adapter or sliding adapter
Fitting for long residual limb
Lamination anchor with threaded connector

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.
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.

7.1.9 Checking the socket after bench alignment

At the end of dynamic alignment optimisation, verify that the minimum distance of the socket to the knee joint has
not been exceeded at maximum extension and maximum flexion. A collision of the socket with the hydraulics or
frame can cause damage to the knee joint.
INFORMATION
If the fitting has been modified from a 3C88-2 or 3C98-2 knee joint to a 3C88-3 or 3C98-3 without fabricating a
new socket, this verification is mandatory. The available space is reduced by approx. 2 mm when the 3C88-3 or
3C98-3 knee joints are used compared to the 3C88-2 or 3C98-2.
C-Leg 3C98-3/3C88-3
Removing 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 stops
1) Insert both flexion stops (to the left and right of the piston rod).
2) Secure screws with thread locking compound.
3) Insert the screws.
4) Tighten the screws to 1.5 Nm with the 710D4 torque wrench.
Preparation for Use
Torque
15 Nm/133 lbf. In.
7 Nm/62 lbf. In.
15 Nm/133 lbf. In.
10 Nm/89 lbf. In.
Ottobock | 59