Helix Ottobock | 41
3.6.3 Possible problem solutions
If the knee joint does not extend during the stance phase after stance phase exion when used with the Helix
3D
hip joint, this may be due to a number of different reasons.Therefore, please check the possible causes and, if
applicable, make the specied adaptations to achieve knee joint extension during the stance phase:
C-Leg / Genium: no extension during the stance phase
Cause Possible solution
The stance phase resistance of the Helix
3D
Hip Joint is
set too high.
Reduce the stance phase resistance (Section 3.6.2).
The stride length, which results from the free swing
range and the swing phase resistance, is set too high.
Increase the swing phase resistance and/or reduce the free
swing range (Section 3.6.2).
The prosthetic alignment is not optimal. Control and optimisation of the sagittal prosthetic alignment
under load (section 3.4).
Stance phase damping of the knee joint is too low. The stance phase damping settings of the knee joint should
be optimised for sitting down and for step-over-step climb-
ing and descending of stairs and ramps.
If the C-Leg®, in addition, does not switch to the swing phase mode at the end of the stance phase when using
the Helix
3D
Hip Joint, this can have the following causes:
C-Leg® does not switch to the swing phase
Cause Possible solution
The forefoot load value is not reached during roll-over. Check the forefoot load during walking using C-Soft and
correct, if necessary
C-Soft Instructions for Use: 647G268).
If the Helix
3D
Hip Joint does not go into extension at heel strike, this can have several causes. Therefore, please
check the following possible causes and, if applicable, make the specied adaptations to achieve extension of
the Helix
3D
Hip Joint at heel strike:
Helix
3D
: no extension at heel strike
Cause Possible solution
The stance phase resistance of the Helix
3D
Hip Joint is
set too high.
Reduce the stance phase resistance (Section 3.6.2).
The stride length, which results from the free swing
range and the swing phase resistance, is set too high.
Increase the swing phase resistance and/or reduce the free
swing range (Section 3.6.2).
The prosthetic alignment is not optimal. Control and optimisation of the sagittal prosthetic alignment
under load (section 3.4).
To Next Page
Loading...
Need help?
General
