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It doesn't sound like this is a computer assisted surgery. I copied info from their website below...I think you can use the TKA code. Hope this helps.
VISIONAIRE Patient Matched Instrumentation
A revolutionary new technology for knee replacement surgery, the VISIONIARE Patient Matched system utilizes patient's MRI and X-Rays to design and create customized surgical instruments based on their unique anatomy.
VISIONAIRE Patient Matched Technology in action
Surgeons upload patient MRI's and X-Rays into Smith & Nephew's advanced web-based software. The software then maps out the patient's anatomy and re-establishes true alignment. Specific cutting blocks and instruments are created that match the outer shape and contours of the patient's knee joint bones. The software also calculates the proper knee joint implant size.
The custom-designed cutting guides and instruments allow orthopaedic surgeons to precisely position the knee implant during surgery avoiding misalignment which can potentially lead to early implant failure.