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NexGen MIS LPS-Flex Mobile Implant System
Surgical Technique
Step Four: Check Extension Gap
After the proximal tibia and distal femur have been
resected, the extension gap is evaluated.
Position the knee in full extension.
Use the spacer/alignment guides or MIS spacer/
alignment guides to check the extension gap, insert
the thinnest appropriate spacer/alignment guide
between the resected surfaces of the femur and tibia.
(Figure 4a). If necessary insert progressively thicker
spacer/alignment guides until the proper soft tissue
tension is obtained.
Drop the alignment rod with coupler into the spacer/
alignment guide. Check the flatness, slope and
alignment of the tibial cut.
Apply varus and valgus stress for optimal ligament
balancing. Ligament releases should be performed
until the extension gap is rectangular.
When the extension gap is balanced, proceed to
size femur, establish external rotation and finish the
femoral cuts.
Figure 4a
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