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1. Using the cross section mode, in the transverse
and coronal view, confirm that the component size
provides adequate coverage on the digitized femur
bone surface (Figure 41). Drag vertically on this
view screen to visualize the superior-most part of
the implant component on the bone (Figure 42).
Assess the transition of the implant component’s
superior tip with the bone surface to avoid
notching.
2. In the sagittal view screen, verify the transition
of the implant component to prevent notching.
Adjust the component AP position and flexion
(use the A and P buttons and/or rotation arrows
in the viewscreen) to achieve the desired anterior
transition within the bone-morphed condylar
surface (Figure 43).
3. Component flexion angle is defined as the angle
between the femoral mechanical axis and the axis
perpendicular to the distal portion of the femoral
component. Assess the posterior coverage of the
component in the sagittal and transverse view
screen, and by dragging vertically on the cross
section view.
4. In the top left coronal solid surface view, if the
surface map is behind the implant (on the cement
side, as opposed to the articulating side), distally,
this is indicative of a shallow distal bone-resection,
or little-to-no bone/cartilage resection, and the
user should consider insetting the component
deeper into the condyle. The Smith & Nephew
JOURNEY™ II CR instrumentation is designed to
remove 9.5 mm off of the unaffected medial distal
femur.
Figure 43.
Confirm that implant component is either flush with
the center of the anterior notch point or proud, but never below
(top right, sagittal viewscreen).
Figure 42.
Evaluate notching in the transverse view screen
by dragging through to the anterior tip of the implant, and
evaluate against the yellow bone surface. The left image
shows superior tip of implant inset into bone, and the right
image shows the superior tip adjusted anterior to bone
surface, to prevent notching.
Figure 41.
Confirm implant sizing and coverage in the trans-
verse view screen (bottom left viewscreen).
6
Implant Planning
