12
Fig. 22
Fig. 23
Fig. 24
Step Five
Size the Femur
Insert the foot of the guide into the joint
and rest the flat surface against the cut
distal condyle. Pull the foot of the guide
anteriorly until it contacts the cartilage/
bone of the posterior condyle. There
should be 2mm-3mm of exposed
bone above the anterior edge of the
guide (Fig. 24). Repeat with additional
guides until the proper size is selected
(Fig. 25). If the condyle appears to be
between two sizes, choose the smaller
size. This helps prevent the patella
from impinging on the prosthesis.
There are seven sizes of femoral
implants and corresponding sizes of
Femoral Sizer/Finishing Guides. The
outside contour of the Femoral Sizer/
Finishing Guides matches the contour
of the corresponding implant.
Insert the prongs on the Insertion
Handle into the corresponding holes
of the appropriate left or right Femoral
Sizer/Finishing Guide (Fig. 22). Then
thread the handle into the guide and
tighten it securely (Fig. 23).
2 to 3mm
Note: Be sure that there is no soft
tissue or remaining osteophytes
between the Femoral Sizer/Finishing
Guide and the cut distal condyle. It
is important that the Femoral Sizer/
Finishing Guide sits flush against
the bone. Any gaps between the
guide and the bone will compromise
the accuracy of the cuts and,
subsequently, component fit may
be compromised. Do not allow the
patella to cause improper alignment
of the guide. The patella may move
the finishing guide medially in a
medial UKA.
2 to 3mm
Fig. 25a Too small
Fig. 25b Just right
Fig. 25c Too large
