Improved accuracy and reproducibility of a novel CT-free rob
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Alignment errors in medial unicompartmental knee arthroplasty (UKA) predispose to premature implant loosening and polyethylene wear. The purpose of this study was to determine whether a novel CT-free robotic surgical assistant improves the accuracy and reproducibility of bone resections in UKA compared to conventional manual instrumentation.

60 matched cadaveric limbs received medial UKA with either the ROSA® Partial Knee System or conventional instrumentation. 15 board-certified orthopaedic surgeons with no prior experience with this robotic application performed the procedures with the same implant system. Bone resection angles in the coronal, sagittal and transverse planes were determined using optical navigation while resection depth was obtained using calliper measurements.

-- Compared to conventional instrumentation, the accuracy of bone resections with CT-free robotic assistance was significantly improved for all bone resection parameters, other than distal femoral resection depth, which did not differ significantly.

-- Moreover, the variance was significantly lower (i.e. fewer chances of outliers) for five of seven parameters in the robotic group.

-- All values in the robotic group had a higher percentage of cases within 2° and 3° of the intraoperative plan.

-- No re-cuts of the proximal tibia were required in the robotic group compared with 40% of cases in the conventional group.

Conclusively, The ROSA® Partial Knee System was significantly more accurate, with fewer outliers, compared to conventional instrumentation.