25
Once the barrel is firmly locked to the pin, proceed to the
tibial reaming using the conical reamer provided. Insert the
dedicated reamer into the guide and prepare the keel hole
parallel to the axis of the bone until the depth stop is
reached. To remove bone use the reamer clockwise, to
compact bone use the reamer counter clockwise (no bone
is excised).
58.
Remove the reamer guide by turning it to the unlocked
position. Assemble the trial keel with the handle and impact
it through the dedicated hole of the trial baseplate, in order
to finish the keel preparation. Remove the trial handle.
59.
9.4 TIBIAL STEM EXTENSION
For additional tibial baseplate stability (if required) a stem
extension can be added to the tibial keel.
Two stem length options are available for primary TKA with
GMK Sphere: 30 mm and 65 mm.
CAUTION
In order to avoid the risk of cortical infraction, carefully plan
preoperatively the positioning of the stem extension with
the help of the X-ray template.
Remove the trial keel from the bone. Assemble the reamer
guide on the trial tibial baseplate and insert the 11 mm
reduction bush in it. Open the intramedullary canal with the
help of the 9 mm drill bit, if needed.
60.
Assemble the T-handle with the 11 mm reamer.
61.
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