We sought to assess the precision of our surgical techniques for total knee replacement in achieving the preoperative plan generated by a combination of MRI scan and long leg radiographs.

For each patient in the study, we used the Visionaire system by Smith Nephew to generate a preoperative plan and custom patient instrumentation according to our usual protocols.

We then performed on three patients a total knee replacement using three different techniques:

Total knee replacement with standard instrumentation.

Total knee replacement with Stryker Computer Navigation.

Total knee replacement with Custom Patient Instrumentation by Smith Nephew.

During surgery we compared the actual bone cuts performed to the cuts predicted by the Visionaire preoperative plan, component sizing, and postoperatively analyzed the alignment achieved for the total knee replacement.

In each case the size used matched the size predicted in our preoperative plan, our bone cuts averaged within 0.5mm of target, and restoration of neutral mechanical alignment of the lower extremity was achieved.

We observed that careful preoperative planning improved our surgical outcomes and regardless of instrumentation used a high level of precision could be achieved.