Otto Bock 3R15 Instructions For Use Manual page 14

4.1.2 Static alignment optimization using L.A.S.A.R. Posture 743L100
(the following steps refer to Fig. 126)
The bench alignment can be substantially improved using L.A.S.A.R. Posture. In order to ensure
appropriate stability combined with easy swing phase initiation, please proceed as follows:
To make the load line visible, the transfemoral amputee stands on the L.A.S.A.R. Posture with
the prosthetic side on the force plate and with the other leg on the height compensation panel.
The prosthesis side should be sufficiently loaded (> 35 % of the body weight).
Now adapt the alignment by only adjusting the plantar flexion of the foot. The load line (laser
line) should be approx. 40 mm anterior to the upper front knee axis (see Fig. 12).
After step 2, dynamic optimisation can take place between parallel bars.
4.2 Combination possibilities
Depending on the patient's functional demands, the following prosthetic feet can be used:
Single Axis Foot (1H...), SACH-Foot (1S...), Dynamic Foot (1D10/1D11) or Greissinger Plus (1A30).
For alignment specifications and weight limits of prosthetic feet, please use the operational instruc-
tions for the respective foot set-up.
4.3 Adjustment and final assembly
4.3.1 Adjusting swing and stance phase
This Modular Knee must be adjusted to the individual needs of each patient. Swing and stance
phase are individually adjusted through the degree of extension assist force, friction and the braking
action which is dependent upon weight bearing.
Before adjusting the knee joint, read the following instructions:
4.3.2 Adjusting swing phase with extension assist
Adjust the tension of the extension spring by turning the adjustment screw. Use a 4 mm hexhead
wrench (fig. 3).
Clockwise rotation:
Counter-clockwise rotation:
4.3.3 Setting swing phase speed with the friction adjustment
Resistance to movement between the knee axis and the brake bushing may be adjusted with the
Set Screw (7). Use a 3 mm hex head wrench (fig. 4).
Clockwise rotation:
Counter-clockwise rotation:
Adjustments of as little as 15 to 20° provide a perceptible change. Settings which are too loose
may cause noise and lead to premature wear. Those which are too tight will cause the brake to be
activated even when not under load.
4.3.4 Adjusting the stance phase control
The responsiveness of the brake effect may be regulated by the stance control adjustment screw.
Use a 6 mm hex head wrench (fig. 5).
Clockwise rotation:
Counterclockwise rotation:
The knee joint functions well only when the extension assist, friction and brake effect are harmoni-
ously adjusted. Take care in making individual adjustments.
14 | Ottobock
increases tension
decreases tension
movement slower
movement faster
braking is less responsive
braking is more responsive
3R15, 3R49