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Persona
®
Revision Knee System
Surgical Technique
Appendix D: Tibial Central Cone
Implant Assembly (cont.)
Tibial Cone Assembly with an Offset or Large
Diameter Stem
The largest straight stems that can fit through the
Trabecular Metal Tibial Central Cones are contained
in the charts above. If the stem implant does not pass
through the Trabecular Metal Central Cone Implant or
it was found during trialing, the Trabecular Metal Cone
Implant will need to be preassembled to the tibial
baseplate implant prior to implanting the construct.
It is highly recommended that new gloves be applied
prior to handling the tibial implant.
Prior to assembly of the final construct, use the 2 mm
hex driver to loosen the set screw to remove the taper
cap from the tibial implant. Ensure the set screw in the
stem housing is backed out in order for the stem to
seat fully (Figure 5).
The tibial impaction base may be used to aid in
assembling the stem implant to the tibial baseplate
implant. Place the tibial baseplate implant on the tibial
impaction base (Figure 6).
Assemble the Trabecular Metal Tibial Central
Cone Implant over the tibial stem housing making
sure to properly align the Trabecular Metal Tibial
Central Cone Implant with the fins of the keel
(Figure 7). If using a straight splined stem, align the
slots of the stem so that one slot runs directly A/P and
the other runs directly M/L (Figure 8).
If using an offset splined stem, insert the stem into the
tibial baseplate implant and rotate the stem until the
predetermined number lines up with the reference
mark on the anterior of the stem housing. Confirm stem
alignment by referencing the provisional components
(Figure 8a).
While protecting the tip of the stem with a soft cloth,
firmly impact the stem to engage the tapers. Lift
the Trabecular Metal Tibial Central Cone Implant and
tighten the set screw with the 2 mm hex driver in a
clockwise direction (Figure 9).
Note:
The 2 mm hex driver has an over-torque
limiter built into the design of the handle so it will
break to prevent over-torquing.
Note: Do not cement the cone prior to tightening
the set screw.
Figure 7
Figure 6
Figure 9
Figure 8
Figure 8a
Stem Extensions
Straight
(Splined)
Cemented
(Smooth)
Fixed
16 mm 16 mm
XSML 18 mm 18 mm
SML 18 mm 18 mm
MED 18 mm 18 mm
LRG 18 mm 18 mm
Ti
b
ial C
en
tr
al C
o
n
es
A
PPE
N
D
IX
D
Figure 5