Ossur OP4 KNEE Gebrauchsanweisung Seite 5

4. On the lateral side of the socket, make a first mark at the midpoint of
the socket at the ischial tuberosity level (D). Make a second mark at the
midpoint of the socket distally (E). Draw a line through both marks.
5. Position the socket so the alignment reference line (B) goes through
first mark at the midpoint of the socket at the ischial tuberosity level (D).
6. Adjust the socket flexion to 5° in addition to the existing position (i.
e., hip flexion contracture) and set the height of the full prosthesis.
7. Use the applicable adapters to connect the knee to the socket.
Warning: After adjustments, all screws must be secured with a medium
strength threadlocker and tightened with the correct torque.
Caution: Adapters used on the distal connection must be cut straight and
inserted down to the end stop of the device's tube receiver. No spacer
should be used (Fig. 2).
Tighten the screws with the following torque:
• Tube Clamp Screw (Fig. 3): 16 Nm
Static Alignment
• Make sure the patient stands with equal weight on both legs.
• Check for correct prosthesis length.
• Check internal / external rotation.
• Check for correct load on toe and heel.
Dynamic Alignment
• Ensure the patient is familiar with the functioning of the device.
• Ensure the patient is familiar with the weight-activated brake function.
Stance phase stability (Fig. 4):
Start carefully with the device's brake function with the patient at the
dynamic alignment and check whether this basic setting matches the
patient's needs. If not, please proceed as follows:
Adjustment using the Load Regulating Screw (A)
The Load Regulating Screw can be used to adjust:
• the point at which the brake acts when (weight-) loading starts,
• and the response of the brake during the dynamic alignment.
Variant 1 - Brake effect shall be induced later:
Turn the Load Regulating Screw (A) to the right which increases the
weight needed by the patient to initiate the brake function.
Variant 2 - Brake effect shall be induced earlier:
Turn the Load Regulating Screw (A) to the left which reduces the weight
needed by the patient to initiate the brake function.
Note: Always adjust the Load Regulating Screw (A) carefully. Note that
you can adjust it against the slight resistance of the threadlocker.
Note: The Load Regulating Screw (A) must not be screwed beyond the
device's brake body. Otherwise, the function of the device cannot be
guaranteed.
Readjusting the brake unit after prolonged use
After a prolonged period of use, play may develop in the device which can
be readjusted using the Service Screw (B).
Turn the Service Screw by small steps to the right.
Carefully check whether the brake function of the device now suits the
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