Survivorship and Outcomes of Robotic-Arm Assisted Medial Unicompartmental Knee Arthroplasty

Inclusion Criteria: * All patients over 21 years of age who underwent primary robotic-arm assisted unicompartmental arthroplasty and received a medial MCK onlay implant and are at least 24 months post-operative. * Patient has signed an IRB approved Informed Consent Form or with IRB approved waiver of written consent, patient has verbally consented to study participations. * Patient willing to comply with follow up. Exclusion Criteria: * Patient will be excluded from participation in the study if they are cognitively unable to answer questions related to their index procedure and health related quality of life forms. * Patient had active infection * Medial MCK onlay implants were implanted without bone cement * Patients did not have sufficient bone stock to allow for insertion and fixation of components * Patient did not have sufficient soft tissue integrity to allow for stability * Patient had a neurological or muscular deformity that did not allow for control of the knee.