24
Tibia Joint Line Reference [Optional- Based
on Surgeon Preference]
The tibia joint line reference allows the user to pick
a landmark point on the bone surface and offset a
line perpendicular to the mechanical axis from that
point.
Tibial Condyle Surface Mapping
The Tibia Free Collection stage (Figure 38) offers a
visualization of the tibial mechanical and rotational
axis previously collected (blue lines) as well as
the discrete tibial landmark points collected above
(yellow dots).
In this stage, the user should digitize the tibial
condyle by moving the point probe over the
entire surface while holding down the footpedal.
The user must input enough information into the
system to appropriately localize the implant during
planning.
Define the anterior and medial edges of the
condyle as far posterior as is accessible. Map
the intercondylar eminence along the axis of the
point probe. Fill in the surface, moving anterior to
posterior as space allows.
Externally rotate the tibia, apply valgus stress,
or hyper-flex to access additional portions of
the articulating condylar anatomy. Collect points
approximately 15 to 20 mm down the anterior and
medial side of the condyle
so that overhang can be identified during implant
planning, and the tibia cut guide can be visualized
on the patient’s anatomy, for placement without
interference. It is important to work the probe
around the medial side of the bone past the medial
point in order to digitize the anatomic shape for
component sizing during Implant Planning.
Figure 37.
Figure 38.
4
Registration
