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STATIC ALIGNMENT
For safety, please make initial adjustments with patient standing
between parallel bars!
•
Fit prosthesis and check for correct length.
•
Make sure foot is flat on the floor, knee is in neutral position and
socket angles are correct.
•
When the patient shifts weight onto the prosthesis, the geometric
lock is activated and the bumper should be slightly compressed.
Modify alignment if necessary.
•
Explain function of stance flexion/geometric lock to patient. Ask
patient to activate it by stepping forward with prosthesis and
transferring weight onto heel.
•
Patient should become accustomed to activating geometric lock and
resulting stance flexion movement.
•
Knee cannot collapse as long as geometric lock is activated.
DYNAMIC ALIGNMENT
The model 1900 Polymer Friction Knee is designed to provide smooth
and fluid friction swing control through the mechanical manipulation of
a unique polymer medium. Swing control can also be enhanced through
use of the extension promoter and optional extension assist.
For safety, please make initial adjustments with patient standing
between parallel bars!
Polymer Friction Adjustment (Figure I)
Friction adjustment screw – clockwise adjustment increases friction
•
Loosen the set screw (15), with a 2.5mm hex wrench ½ turn. Do not
completely remove the set screw from the housing unit.
•
Using a large blade screwdriver, turn the adjustment screw on the
anterior aspect of the knee (16) clockwise to increase friction
resistance to flexion and extension.
•
Do not exceed ¼ turn for maximum adjustment (17).
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After obtaining the desired friction setting, you must tighten the set
screw (15) to secure the adjusted setting. DO NOT over tighten the
set screw. Torque to 2Nm(17 in-lbs).
Bumper adjustment
•
Try different bumpers and select the most comfortable one.
•
Final bumper selection may vary from bumper indicated for
patient's weight according to table.
•
Soft bumpers increase the locking moment of the Geometric Lock
and increase stance flexion motion.
•
Hard bumpers decrease the locking moment of the Geometric Lock
and decrease stance flexion motion.
•
Foot selection influences bumper selection.
a. For soft heels, choose a softer bumper.
b. For hard heels, choose a hard bumper.
Shim adjustment (Figure G)
Adding shims changes the release point of the Geometric Lock allowing
for swing phase knee flexion. This affects knee stability and ease of
walking and sitting. The shims are thin plastic plates which are installed
underneath the bumper to adjust its height. A change in height affects
the knee's release point.
•
More shims: easier release into swing flexion and decreased stance
flexion
•
Less or no shims: increased safety, increased stance flexion and
delayed release into swing flexion
NOTE: There are two different types of shim. The thicker ones are
0.76mm thick and clear, the thinner ones are 0.38mm thick and grey. We
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