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NexGen MIS LPS-Flex Mobile Implant System
Surgical Technique
MIS Quad-Sparing
™
Arthrotomy
Training available at The Zimmer Biomet Institute.
Prior experience with the MIS Midvastus, Subvastus
or Medial Parapatellar approach is helpful before
attending the MIS Quad-Sparing Arthrotomy Course.
Soft Tissue Releases
Total knee arthroplasty is a soft tissue operation as
well as a bone resection operation. The objective of
this procedure should be to distribute contact stresses
across the artificial joint as symmetrically as possible.
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Soft tissue balancing is vital to help assure implant
stability. The basic principle for ligament release entails
that the tight contracted concave side is lengthened
to match the convex side. The goal is to maintain a
consistent and rectangular, not rhomboidal flexion
and extension gap.
After accessing the knee joint, balancing of the soft
tissue structures and removal of osteophytes is
initiated. Osteophytes may tent the medial capsule
and ligamentous structures, and removal can produce
a minimal correction before beginning the soft tissue
release. Posteromedial osteophytes may need to be
removed after the proximal tibia is resected.
When using a posterior stabilized implant, removing
the posterior cruciate ligament (PCL) will make it easier
to balance the collateral ligaments. It is necessary to
completely resect the PCL.
Figure 9
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