Robotic-Assisted Medial Unicompartmental Knee Arthroplasty in an Outpatient Setting.

There were 63 outpatient medial unicompartmental knee arthroplasties (UKAs) performed by Mako robotic assistance by six surgeons. There were 40 men and 23 women who had a mean age of 65.1 years (range, 38 to 80). Their mean body mass index (BMI) was 29.6 (range 21.8 to 39.2), and 28 patients had a BMI over 35. Overall, patient perceptions of the procedure were excellent (mean 9.2 rating of 10), which was not different by sex or body mass index. There were no 30-day complications or readmissions. At one year, there was one case revised for maltracking, resulting in a revision rate of 1.6% (1 out of 63 patients) with no cases of aseptic loosening. There were two other patients that had minor procedures (nerve ablation and removal of a loose body). The results of this prospective study confirm that outpatient robotic-arm assisted medial UKA is safe and feasible with a positive patient perspective of the procedure.