Zimmer Persona Trabecular Metal Femoral Component, Surgical Technique, Page: 11 / 24

6
SECTION
3
Size Femur and Establish External Rotation
Size
1
Size
7
Size
12
3 . 2 mm Drill
00-5120-085-00
• After the Anterior Referencing sizer is appropriately
positioned on the femur, read the femoral size from the
engraved lines on the sizer tower and select the closest
size
(Fig. 17) . There are six even-sizes labeled on the left
side of the tower and six odd-sizes labeled on the right side
of the tower, with lines indicating the in-between sizes.
The 3° or 5° holes in the midline of the A/P portion of the
sizer are used to drill 3.2mm holes for pegs on the Anterior
Referencing 4-in-1 Femoral Cut Guide
(Fig 18) . A 3.2mm
pin may be placed in the first drilled hole to maintain an
“index” position prior to drilling the second hole. Remove
the screws, then remove the sizer.
• Slightly extend the knee and retract soft tissues to expose
the anterior femoral cortex. Clear any soft tissue from the
anterior cortex. Ensure that the leg is in less than 90° of
flexion (70°-80°). This will decrease the tension of the patellar
tendon to facilitate placement of the Anterior Referencing
Sizer Boom. The Anterior Referencing Sizer Boom telescopes
proximally/distally to facilitate optimal placement along
the anterior cortex. The engraved lines along the top of the
boom approximate the anterior flange lengths of the size 1,
7, and 12 femoral components
(Fig. 16a)
. Once the Anterior
Referencing Sizer Boom is appropriately positioned, it should
be locked in place by tightening the knob at the end of the
boom clockwise
(Fig. 16b) .
TECHNIQUE TIP 3.C
- Lock boom after positioning to reduce the toggle of the boom tip.
This will also reduce the risk of notching.
- Positioning the sizing boom tip on the “high” part of the femur
by lateralizing the location of the sizing boom tip can often lessen
the likelihood of notching the femur.
- To size accurately, the sizing boom should be telescoped to the
size read from the tower. If the boom is telescoped to the exact size,
the tip of the boom will approximate the exit point of the saw blade
through the anterior cortex.
TECHNIQUE TIP 3.D
- The Multi Pin Puller cannot be used to extract the screw(s).
-
This Anterior Referencing Sizer works only with these Anterior
Referencing 4-in-1 Femoral Cut Guides and Provisionals,
and implants referenced in this technique.
Fig. 16a
Fig. 16b
Fig. 18
Fig. 17
3 . 2 mm x 75 mm
Trocar Tipped Drill
Pin ( 2 . 5 mm hex)
00-5901-020-00
Instruments