Zimmer MIS Multi-Reference Surgical Technique page 32

30
Zimmer MIS Multi-Reference 4-in-1 Femoral Instrumentation Surgical Technique
Turn the depth gauge wing on the
Patellar Reamer Clamp to the proper
indication for the correct amount of
bone that is to remain after reaming
(Fig. 7g).
Fig. 7g
Attach the appropriate size Patellar
Reamer Blade to the appropriate
size Patellar Reamer Shaft (Fig. 7h).
Use only moderate hand pressure to
tighten the blade.
Fig. 7h
Do not overtighten the blade. Insert
the Patellar Reamer Shaft into a drill/
reamer. Insert the reamer assembly
into the Patellar Reamer Surfacing
Guide. Raise the reamer slightly off
the bone and bring it up to full speed.
Advance it slowly until the prominent
high points are reamed off the bone.
Continue reaming with moderate
pressure until the step on the reamer
shaft bottoms out on the depth gauge
wing of the Patellar Reamer Clamp.
Remove the reamer clamp assembly.
Proceed to "Finish the Patella" on
page 31.
Insetting Technique
Use the Patellar Reamer Insetting
Guides as templates to determine the
appropriate size guide and reamer.
Choose the guide which will allow
approximately 2mm between the
superior edge of the patella and the
outer diameter of the guide (Fig. 7i).
Fig. 7i
2mm
Insert the appropriate size Patellar
Reamer Insetting Guide into the
Patellar Reamer Clamp. Turn the
locking screw until tight. Apply the
Patellar Reamer Clamp at a 90° angle
to the longitudinal axis with the
Patellar Reamer Insetting Guide on the
articular surface. Squeeze the clamp
until the anterior surface of the patella
is fully seated against the fixation
plate. Turn the clamp screw to hold
the instrument in place. The anterior
surface must fully seat on the pins and
contact the fixation plate.
Turn the clamp wing to the "inset"
position.
Attach the appropriate size Patellar
Reamer Blade to the appropriate
size Patellar Reamer Shaft (Fig. 7j).
Use only moderate hand pressure to
tighten the blade. Do not overtighten
the blade. Insert the Patellar Reamer
Shaft into a drill/reamer.
ON
OFF
Fig. 7j
Use the Patellar Reamer Depth Stops
to control the amount of bone to be
removed based on the thickness of the
implant chosen.
NOTE: If using a Primary Porous Patella
with Trabecular Metal Material, all
™
implants are 10mm thick.