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C-Leg® Adjustment Overview Continued, page 2
D: Stance Phase Adjustments
(Dynamic Fine Adjustment)
7. Stance Flexion Damping
Fine-tune the Stance Flexion Damping for smooth,
secure resistance while descending stairs and ramps.
When this is set properly for these activities, the
resistance should be adequate for stumble recovery.
Usual adjustment range is 90-104.
8. Stance Extension Damping
Start at 120. This adjustment is necessary for those users
who walk with stance phase knee flexion. If they do not
exhibit stance phase knee flexion during the gait cycle,
this adjustment will not change their gait pattern and
can be left at 120. If they do exhibit stance phase knee
flexion during the gait cycle, this adjustment will be set
to either 115 or 120 for most users. Stance Extension
Damping will smooth the transition from a flexed knee
at the end of loading response to a fully extended knee
during terminal stance. After observing the user's gait
pattern changes can be made to this adjustment to
ensure smooth extension of the knee at terminal stance.
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9. 2nd Mode and 3rd Mode Adjustments
1. Basic Flexion Damping
(Starting Position of the valve)
This adjustment sets the valve position when fully
extended. At 20 the valve is wide open. At 120 the valve
is fully closed.
2. Increased Damping with Knee Angle
(Rate at which the valve closes)
This adjustment tells the microprocessor how fast the
valve should close based on the knee angle. At zero the
valve does not change position from the starting position
(Basic Flexion Damping value) as the knee is flexed. At
one the valve closes very slowly as the knee is flexed. At
50 the valve closes very fast as the knee is flexed.
These two adjustments should be adjusted together to
allow a certain degree of knee flexion until the knee
locks in that position. If the user wishes to have minimal
resistance (free swing) in 2nd mode, for example when
riding a bicycle, set both values to a minimum (20 and
0). If the user has this configuration for 2nd Mode,
remind them to switch back to 1st Mode immediately
after bike riding or to actively use the hip extensors
when walking in 2nd Mode. If the user wishes the knee
to be locked in full extension for 2nd Mode, set Basic
Flexion Damping at maximum (120). Bicycling cannot
be selected for 3rd Mode due to safety.
E: Document All Adjustment Values
10. Data Overview
The Data Overview allows settings to be saved to the
computer or printed. The settings can also be moved
over from the computer to a C-Leg. The "Amputee Fitting
Protocol" in the C-Leg manual can be used to document
more information (length of pylon, etc.).
This Abridged Version is meant as a quick overview.
Please read the Instruction Manual completely to fully
understand all C-Leg functions and adjustments.
Further information on training a user to utilize the
C-Leg can be found on Quick Guide #3 C-Leg Patient
Training Overview
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