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The Knee Care Press


Study confirms high accuracy of a new robotically assisted technique for total knee arthroplasty

Robotic Total Knee Arthroplasty (TKA) has gained popularity over the last few years for improving the accuracy of implant positioning and reducing issues with limb alignment when compared with a conventional jig-based TKA. Pain, instability and limitation of the range of motion are the most commonly reported symptoms among unsatisfied patients. The major causes of unsuccessful TKA are inadequate alignment and errors in balancing.

The aim of the study was to evaluate the accuracy of the robotically assisted method to see if outcomes for patients could be improved. 75 patients underwent total knee arthroplasty using a new, robotic system (ROSA® Knee System; Zimmer Biomet, Warsaw, IN) with a Posterior Stabilized Total Knee Arthroplasty (Persona® Knee System). The planned, validated and measured angles and cuts for the distal and posterior femur, for the proximal tibia and for the final coronal alignment on long standing X-rays were compared to determine whether there was a variation in the accuracy of the robot or the jig procedures.

A significant difference was found only between the average planned and the average validated angle for femoral flexion, tibial coronal axis, medial and lateral cuts. The average difference was below 1 mm or under 1 degree and no statistical difference was found between planned validated and measured cuts. The average difference between planned HKA and measured was 1.2 ± 1.1. Simply put, no statistically significant difference was found.

This study demonstrates that when using this new surgical robot in total knee arthroplasty, surgeons can perform accurate bone cuts and achieve the planned angles and resections necessary, possibly within hybrid techniques that include new and conventional technology. The study suggests that using this new surgical robot in total knee arthroplasty will reduce the number of patients affected by alignment and balancing issues to improve patient satisfaction after TKA procedures.

Rossi S M P, Sangaletti R, Perticarini L, Terragnoli F, Benazzo F. Read more:

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