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Knee. 2017 Mar;24(2):419-428. doi: 10.1016/j.knee.2016.12.001. Epub 2017 Feb 6.

Survivorship and patient satisfaction of robotic-assisted medial unicompartmental knee arthroplasty at a minimum two-year follow-up.

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Hospital for Special Surgery, 535 East 70th St, New York, NY 10021, USA. Electronic address:
Hospital for Special Surgery, 535 East 70th St, New York, NY 10021, USA. Electronic address:
Hospital for Special Surgery, 535 East 70th St, New York, NY 10021, USA. Electronic address:
Coon Joint Replacement Institute, 6 Woodland Road 202, St. Helena, CA 94574, USA. Electronic address:
Legacy Salmon Creek Hospital, 2211 NE 139th Street, Vancouver, WA 98686, USA. Electronic address:
Holy Cross Hospital, 103 SE 1st Ave, Fort Lauderdale, FL 33316, USA. Electronic address:



Successful clinical outcomes following unicompartmental knee arthroplasty (UKA) depend on lower limb alignment, soft tissue balance and component positioning, which can be difficult to control using manual instrumentation. Although robotic-assisted surgery more reliably controls these surgical factors, studies assessing outcomes of robotic-assisted UKA are lacking. Therefore, a prospective multicenter study was performed to assess outcomes of robotic-assisted UKA.


A total of 1007 consecutive patients (1135 knees) underwent robotic-assisted medial UKA surgery from six surgeons at separate institutions between March 2009 and December 2011. All patients received a fixed-bearing metal-backed onlay implant as tibial component. Each patient was contacted at minimum two-year follow-up and asked a series of five questions to determine survivorship and patient satisfaction. Worst-case scenario analysis was performed whereby all patients were considered as revision when they declined participation in the study.


Data was collected for 797 patients (909 knees) with average follow-up of 29.6months (range: 22-52months). At 2.5-years of follow-up, 11 knees were reported as revised, which resulted in a survivorship of 98.8%. Thirty-five patients declined participation in the study yielding a worst-case survivorship of 96.0%. Of all patients without revision, 92% was either very satisfied or satisfied with their knee function.


In this multicenter study, robotic-assisted UKA was found to have high survivorship and satisfaction rate at short-term follow-up. Prospective comparison studies with longer follow-up are necessary in order to compare survivorship and satisfaction rates of robotic-assisted UKA to conventional UKA and total knee arthroplasty.


Robot; Robotic; Satisfaction; Survivorship; UKA; Unicompartmental knee arthroplasty

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