A1071. TWO YEAR OUTCOMES OF ROBOTICALLY GUIDED UKA

Abstract

Clinical outcomes of UKA procedures are sensitive to malalignment of the components, and thus show significant variability in the literature. This study evaluates the two year clinical results of a new surgical procedure designed to significantly increase the accuracy and precision of the alignment of the components, and thus increase postoperative functional outcomes.

A new UKA technique has been developed, which combines tactile guided robotic technology with image guided surgery. Three-dimensional planning of the implant positioning is followed by precise resection of the bony surfaces. To date, 73 (42 male, 31 female) patients (average age: 70±10yrs) are 2 years postoperative with all patients enrolled in an IRB approved outcomes registry. The tibial component was an allpoly inlay design.

At two year followup, all patients showed significant improvements, compared to pre-operative values, in Knee Society Knee (p< 0.0001) and Function (p< 0.0001) scores, sf-12 PCS scores (p< 0.0001), WOMAC total scores (p< 0.0001) and WOMAC pain (p< 0.0001), stiffness (p< 0.0001) and physical function (p< 0.0001) subscores. The tibial components of two patients have been revised to a standard metal backed onlay UKA for loosening.

This initial series of robotically guided UKA implantations provided significant improvement in the postoperative function of patients in every functional measurement with only two revisions to date, likely for improper patient selection. These patients were revised to standard UKA components. The introduction of new procedures and technologies in medicine is routinely fraught with issues associated with learning curves and unanticipated pitfalls. Because the explicit objectives of this novel technology are to optimize surgical procedures to provide more safe and more reliable outcomes, these favorable results provide the potential for significant improvements in orthopedic surgery.