Össur RHEO KNEE 3 Mode D'emploi page 9

The following values are acceptable calibration ranges:
• Toe load (-2.5 to 2.5)
• Heel load (-2.5 to 2.5)
WARNING: Improper calibration (for example if load is applied on the knee or socket is connected) affects the
knee's ability to perform optimally and may compromise the user's safety.
RECOMMENDED ALIGNMENT OF THE DEVICE
RECOMMENDED COMPONENT SELECTION
Please refer to the list of recommended components for the device in the Össur catalog.
BENCH ALIGNMENT
1. Connect the device to the foot (with the foot cover on) using corresponding Össur adapters / connectors.
2. Establish knee center height.
3. Mount the socket to the device using corresponding Össur adapters / connectors.
4. The alignment reference line should pass through a sagittal plane bisection of the socket, the knee center and
the posterior 1⁄3 of the foot. (Figure 2)
NOTE: If stability modifications are desired after patient assessment; the reference line can be shifted up to 5 mm
(3/16") anterior or 5 mm (3/16") posterior to the knee center.
CAUTION: As the alignment reference line is positioned more posterior to knee center, the user will experience
more stance flexion during loading response. Additional voluntary control will be required to maintain knee
stability when the device is powered OFF.
PRECAUTION: At maximum flexion, maintain minimum distance of 3 mm (1⁄8") between the device and the
socket. At maximum flexion where contact cannot be avoided due to socket volume, make sure that the contact is
on the frame, directly below the user interface panel. For maximum pressure distribution maintain a flat and
cushioned contact surface (Figure 2).
STATIC ALIGNMENT
1. Ask the user to stand with equal weight on each foot and make sure that the pelvis is level (Figure 5).
2. Evaluate sagittal and coronal alignment for correct position of the alignment reference line.
3. The alignment reference line should pass through a sagittal plane bisection of the socket, the knee center and
the posterior 1⁄3 of the foot module.
NOTE: If stability modifications are desired after patient assessment; the reference line can be shifted up to 5 mm
(3/16") anterior or 5 mm (3/16") posterior to the knee center.
DYNAMIC ALIGNMENT
The best way to acquire a dynamic alignment is by having a symmetric gait pattern.
The initial dynamic assessment is important for getting the user familiar with relying on the prosthesis. Össur
recommends that this assessment is completed at the parallel bars. Complete general dynamic alignment at the
same time.
1. Evaluate the user's level of voluntary control by having the user walk with the device powered off. The user
should have the ability to maintain knee stability when the power is off.
2. Use hip extension to maintain stability into stance.
3. Have the user experience the response, the roll-over, of the foot.
4. Load the heel and allow the knee to flex, thus experience the resistance provided by the knee.
a. Control the rate of the knee flexion with hip extension.
b. Perform rapid loading of the prosthesis with use of the parallel bars.
5. Train the user to maintain normal step length on the sound side.
6. Ask the user to sit down using the stance resistance of the device.
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