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The Implant Planning stage presents to the user
a virtual reconstruction of the patient’s femoral
and tibial anatomy and visualizes soft-tissue
ligament tension to aid in joint balance in extension
and flexion of the patient knee. There are two
visualization modes for implant placement, solid
surface view (Figure 40a) and cross section view
(Figure 40b). The screen shows four primary
viewscreens used to manipulate the implant
component. Counter-clockwise from top right are
standard sagittal, coronal and transverse views.
While in the solid surface mode, the user can
manipulate these views in 3D space and they will
always snap back to their original orientation. The
bottom right view is a “sticky” view that will hold its
orientation when manipulated by the user.
In the solid surface mode, the user can also
visualize virtual bone cuts based on the implant
plan, and toggle the implant component on the
virtually prepared bone by using Button A, as
shown in Figure 40b.
The cross section mode allows the user to drag
a finger vertically over the highlighted window to
fly through cross sectional slices of the femur in
either the sagittal, corona,l or transverse planes
and visualize the position of the implant in that
particular slice within the plane.
The goal of Implant Planning is to allow the user to
localize the components and balance key metrics
along the way.
There are three stages in Implant Planning: (1) Intial
Component Sizing and Placement, (2) Soft Tissue
Balancing, and (3) Cut Guide Placement.
Initial Component Sizing and Placement
Femur Placement
The NAVIO™ software will attempt to provide a
starting size and initial placement of the femoral
component (Figure 40c) utilizing the landmark points
that were collected during Registration (Section 4).
From the initial placement, the user has the ability
to adjust the size and placement of the component.
When localizing the component on the digitized
surface, the following are key metrics to consider
for planning:
Figure 40a.
A
Figure 40b.
Figure 40c .
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Implant Planning
