Otto Bock C-Leg Quick Manual

Quick Guide #2
C-Leg® Adjustment Overview
Connect the Interface Cable to the C-Leg and to the PC before starting C-Soft software.
s
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Attention: ONLY make adjustments when the user is standing still or sitting!
A: Sensor Calibration
Calibration (Zero Setting)
The system can be calibrated prior to the user donning
the prosthesis: Simply hold the knee in full extension
with the foot off the ground and hit the "Calibrate"
button. Or, have the user stand with knee extended and
prosthesis off the ground. Click on "Calibration." Plumb
bob icons will appear over both the Knee Angle Box and
Toe and Heel Load Box.
B: Stance Phase Adjustments
2. Static Maximum Toe Load
(Preliminary Adjustment)
Enter the length of the prosthetic foot (in cm) and the
user weight in the appropriate boxes. An estimated
Maximum Toe Load will be generated. Click "Accept
value." Note: This setting may be too high for a new user
initially. You may need to manually lower this setting for
the user to successfully initiate swing.
3. Static Stance Flexion Damping
(Preliminary Adjustment)
Have the amputee sit down slowly. The user should
feel the stabilizing effect of the C-Leg stance resistance.
Adjust so that the user can sit comfortably. Make sure
that the user "loads" the prosthesis while sitting.
4. Dynamic Maximum Toe Load
(Dynamic Fine Adjustment)
Automatic Adjustment: Have the user begin walking
and the computer looks for ten consistent steps. When
the computer has counted down to zero, a Maximum Toe
Load value will be generated.
Manual Adjustment: If the user has an inconsistent gait
pattern the manual adjustment may be used. Have the
amputee walk and examine the Toe Load Box. Adjusting
the Maximum Toe Load parameter up or down changes
the position of the orange line in the toe load area. When
properly adjusted the blue toe load boxes should just
come up to meet the orange line not going above or
below the line for most steps.
The Maximum Toe Load should be checked walking
at the user's average gait speed before completing the
fitting session after alignment is complete.
Adjusting plantar and dorsiflexion will affect
this setting!
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C: Swing Phase Adjustments
(Dynamic Fine Adjustment)
5. Swing Phase Control (heel rise control)
With the user walking in the parallel bars, check swing
phase movements of the shin and make necessary
adjustments (see 5.1 to 5.3). Recheck outside the
parallel bars when the user is ready. To optimize these
parameters, unplug the Interface Cable (if applicable) so
the user can move around freely.
5.1 Dynamic Factor
Start at two. This parameter is used to adjust the
dynamic swing flexion damping of the C-Leg. Increase
Dynamic Factor to lower heel rise if it is excessive. Lower
Dynamic Factor to increase heel rise if it is insufficient.
It is important to have the user walk at all gait speeds
(especially at a fast pace). This adjustment continuously
readjusts the flexion resistance as the user changes
walking speeds.
5.2 Knee Angle Threshold
Start at 40. Adjust the knee angle threshold to
determine when Dynamic Factor resistance should
activate. This should be lowered if damping feels too
abrupt to the user. It should be raised or lowered if just
a small increase or decrease in heel rise is necessary.
Typical range is 35-45. Observe the knee angle being
achieved by watching the angle being measured in the
knee angle box.
5.3 Initial Swing Flexion Damping (this setting only
appears on the "Advanced Settings"screen)
Start at 20. This setting resists all knee flexion at a
constant rate. Leave this adjusted
to a low level (minimum) for
energy efficiency.
6. Swing Extension Damping
(terminal impact control)
Start at 70. Adjust to dampen
terminal impact during swing
phase. Watch for equal stride
length and equal timing. Usual
adjustment range is 60-75.