Zimmer Biomet Persona, Хирургическая техника, Страница: 56 / 72

54 |
Persona
®
Revision Knee System
Surgical Technique
Appendix C: Femoral Central
Cone Preparation
Cannulate Ream (Small, Medium, Large, Extra-
Large Femoral Central Cone Preparation Only)
Insert the extension post and stem provisional into
the canal and verify that the thick femoral depth line
on the stem extension post is level or proximal to the
distal cut. Ensure the stem extension post is stable in
the canal. Tap into place, if necessary (Figure 1).
Ream by placing the 22.5 mm cannulated reamer over
the stem extension post. Start power prior to contact
and ream until the thick line on the reamer is aligned
with the distal surface of the femur (Figure 2).
Optional Femoral Defect Sizing
Select the femoral central cone provisional that
approximates the size and depth of the defect. Invert
the cone provisional to simulate the size of distal void
that the cone will accommodate and insert it over the
stem extension post.
Figure 4 Figure 5
Figure 2
Figure 3
Figure 1
Optional Drill Guide (Medium, Large, Extra-Large
Femoral Central Cone Preparation Only)
Note: The intent of the drill guide is to clear away
bone from the distal condyles. It does not prepare
the bone for the cone, only access to the diaphysis.
Insert the desired drill guide over the stem
extension post, taking care to ensure the anterior
mark on the broach aligns with the anterior femur
(Figure 3). Position the drill guide against the distal
surface of the femur. If needed, trocar pins or
3.5 mm hex headed screws can be inserted into the
side pinning holes in order to increase rotational
stability while drilling. Using the 5 mm hex driver,
tighten the captured set screw on the drill guide to
secure to the stem extension post (Figure 4).
Drill through each hole with the drill bit to remove
desired bone (Figure 5). Remove the drill guide and
any remaining bone prior to broaching.
Note:
Alternatively, a tilt reamer can be used to
manually remove bone if desired.
A
PPE
N
D
IX
C Thick Femoral Depth Line
Thick Femoral Depth Line