Otto Bock C-Leg 3C98-3 Instructions For Use Manual page 22

8.1.1 Standing
8.1.1.1 Stance function
INFORMATION
To use this function, it must be enabled by the O&P professional. It also has to be activated
using the Cockpit app (see page 26).
The stance function is a functional supplement to the basic mode. This function makes it easier
for the user to stand on an inclined surface for a longer time. The joint is fixed in the flexion direc­
tion at a flexion angle between 5° and 65°.
The type of joint locking (intuitive/deliberate) has to be established by the O&P professional. The
locking type cannot be changed using the Cockpit app.
Intuitive locking of the joint
The intuitive stance function recognises any situation that puts strain on the prosthesis in the flex­
ion direction but where flexion is not permitted. Examples of this include standing on uneven or
sloping surfaces. The knee joint is always locked in the flexion direction when the prosthetic leg is
not fully extended and is kept still for a brief moment. Upon forward or backward rollover or exten­
sion, the level of resistance is immediately reduced to stance phase resistance again.
The knee joint is not locked when the above conditions are met and a sitting position is assumed
(for example while driving).
Deliberate locking of the joint
1) Assume the desired knee angle.
2) Do not change the knee angle for a brief period.
→ The blocked joint can now be loaded in the flexion direction.
Deliberate unlocking of the joint
► The deliberate stance function is automatically deactivated again by extending the knee or by
repositioning the leg (e.g. taking a step).
8.1.2 Walking
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Knee control through high hydraulic resistance and correct static alignment.
A stance function can be enabled using the adjustment software. Please see
the following section for further information on the stance function.
Initial attempts at walking with the prosthesis always require the instruction of
trained, qualified personnel.
The hydraulics stabilise the knee joint in the stance phase and release the
knee joint in the swing phase so that the leg can swing forward freely.
Switching to the swing phase requires that the prosthesis roll over to the front
out of the stride position.