6
Tibial Cones Surgical Technique
The LEGION™ Tibial Cones were designed to be
used with the LEGION Revision (RK) and LEGION
Hinge (HK) Tibial Baseplates and the range of
offset couplers. There is a maximum of 25° of
rotational freedom between the Tibial Baseplate
fins and the Tibial Cone.
If utilizing offset couplers, reference the below
sizing guide and the following technique.
Minimum Tibial Cone Size with Offset Couplers
Note: The labeled sizes of the LEGION Cones are
the functional internal diameters (ID). The IDs are
relative to the functional diameters of LEGION
Press-Fit Stems including the 1mm diametrically
oversized cutting flutes. For example, a size 22
ID LEGION Tibial Cone can accept up to a 22mm
LEGION Press-Fit Stem without offset.
1. With the offset amount and Stem size desired,
reference the chart for the minimum Tibial Cone
Size needed to accommodate the desired
implant construct.
Stem Diameter
<18
18
20
22
24
Max Offset
0
18
18
20
22
24
2mm
20
20
22
24
26
4mm
22
22
24
26
28
6mm
24
24
26
28
30
Minimum Tibial Cone Size
2. To calculate the minimum Cone internal diameter
needed, add the Stem size or 18mm (whichever
is greater) to the desired offset.
Example: If you have used a 22mm reamer with
a 4mm offset coupler, the minimum size Tibial
Cone required (or larger) is 26.
Example: If a 15mm Reamer is used with a 2mm
offset, the minimum size Cone required is 20.
18 is greater than the 15mm Reamer, therefore
18+2 = 20 minimum.
