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NexGen MIS LPS-Flex Mobile Implant System
Surgical Technique
Step Two:
Establish Femoral Alignment
Use the 8 mm IM drill w/step to drill a hole in the
center of the patellar sulcus of the distal femur (Figure
2a) making sure that the drill is parallel to the shaft
of the femur in both the anteroposterior and lateral
projections. The hole should be approximately one-half
to one centimeter anterior to the origin of the posterior
cruciate ligament. Medial or lateral displacement of
the hole may be needed according to preoperative
templating of the A/P radiograph.
The step on the drill will enlarge the entrance hole
on the femur to 12 mm. Suction the canal to remove
medullary contents.
The adjustable IM alignment guide is available with
two intramedullary rod lengths. The rod on the
standard instrument is 229 mm (9 in) long and the rod
on the short instrument is 165 mm (6.5 in). Choose
the length best suited to the length of the patient’s
leg which will provide the most accurate reproduction
of the anatomic axis. If the femoral anatomy has
been altered, as in a femur with a long-stem hip
prosthesis or with a femoral fracture malunion, use
the short adjustable IM alignment guide and use the
extramedullary alignment technique.
Note:
It is preferable to use the longest
intramedullary rod to provide the most accurate
replication of the anatomic axis.
Set the adjustable IM alignment guide to the
proper valgus angle as determined by preoperative
radiographs. Check to ensure that the proper “Right”
or “Left” indication (Figure 2b) is used and engage the
lock mechanism (Figure 2c).
Figure 2a
Figure 2b
Figure 2c
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