UKA patients had higher preoperative ROM, and Knee Society pain (KSP), functional (KSF), and clinical (KSC) scores (p < 0.001, p = 0.0008, p = 0.0003, p = 0.051 respectively). Mean tourniquet times, operative times, and lengths of stay were lower after UKA. Four TKA patients required transfusion. Mean follow-up was 2.3 years. The frequency of manipulation under anesthesia was higher in TKA patients (p < 0.001), while the rate of component revision was similar between the two groups (1.2% vs. 1.7%, p = 0.328). Frequency of deep infection was lower in the UKA group (p = 0.016). Postoperative KSF, change in KSF, and ROM were higher (p < 0.0001) after UKA, but KSP and KSC were equivalent.