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NexGen MIS LPS-Flex Mobile Implant System
Surgical Technique
Surgical technique is an important factor to consider
when attempting to maximize range of motion in
total knee arthroplasty. Close attention must be paid
to balancing the flexion and extension gaps, clearing
posterior osteophytes, releasing the posterior capsule,
and reproducing the joint line.
Although the joint line may change as a result of
a posterior cruciate substituting procedure, it is
important that an attempt be made to maintain the
joint line when high flexion is a priority. Depending
on the degree, altering the joint line can cause
patellofemoral issues and limit the degree of flexion.
An elevated joint, for example, can cause tibiofemoral
tightness in rollback and thus restrict flexion.
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When using the gap technique, it is possible that
the joint line may be moved proximally, especially if
there is a preoperative flexion contracture or if the
selected femoral component is smaller than the A/P
dimension of the femur. The alteration of the joint line
can be minimized by accurately measuring for the
femoral component size and performing a posterior
capsulotomy to correct flexion contractures.
Patient Preparation
To prepare the limb for total knee arthroplasty,
adequate muscle relaxation is required. This will
facilitate the eversion of the patella, if desired, and
minimize tension in the remaining quadriceps below
the level of the tourniquet. It is imperative that the
muscle relaxant be injected prior to inflation of the
tourniquet. Alternatively, spinal or epidural anesthesia
should produce adequate muscle relaxation.
If using a tourniquet, apply the proximal thigh
tourniquet and inflate it with the knee in hyperflexion
to maximize that portion of the quadriceps that
is below the level of the tourniquet. This will help
minimize restriction of the quadriceps and ease
patellar eversion.
Once the patient is draped and prepped on the
operating table, determine the landmarks for the
surgical incision with the leg in extension.
Surgical Technique
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