Zimmer Biomet iASSIST Knee Manual page 25

Tibial Registration (cont.)
10. Slide the tibial positioner towards the bone until
the tibial adjustment mechanism sits on the
anterior cortex of the tibia.
Warning: Ensure that the tibial positioner is
well seated on the horizontal shaft of the tibial
alignment guide.
Warning: For a small size tibia, the tibial
adjustment mechanism should be placed on the
tubercle. In this case, care must be taken when
securing the tibial adjustment mechanism to
the bone using the 3.5 X 38 mm hex head screw
to avoid potential interference between the
screws and the spikes of the tibial alignment
guide.
x3
Figure 3.8
Proximal Tibia Cut – Tibia Registration (Continued)
11. Use three 3.5 X 38 mm hex head screws to secure
12. To initiate the tibial registration, release the tibial
iASSIST 2-Pod Version Surgical Technique
23 |
the tibial adjustment mechanism to the bone.
Note: Secure the tibial adjustment mechanism
to the bone by first securing screws in the
medial hole, secondly in the upper lateral hole,
and finally in the lower lateral hole.
Warning: Control the speed of the power tool
or finish fixating the screws manually to avoid
stripping the cortex of the tibia. The 500 RPM
adaptor of the Zimmer Universal Power System
Surgical Instruments can be used to secure
screws.
From registration to validation, the instruments
must remain stable and properly fixated to the
bone to ensure accuracy of the system.
positioner from the tibial adjustment mechanism
by pulling upwards on the tibial positioner handle.