Unicompartmental knee arthroplasty (UKA) - also known as unicondylar knee arthroplasty or partial knee replacement - is an excellent surgical option for the treatment of isolated medial, lateral and patellofemoral compartment arthritis of the knee, as long term results suggest high patient satisfaction and survivability that rivals total knee arthroplasty (TKA). These procedures are well-suited for rapid recovery protocols and outpatient surgery through well-structured surgical pathways. With demand increasing for knee arthroplasty, patients presenting sooner and at a younger age, and an ever-increasing interest from patients, surgeons and payors in outpatient surgery, the demand for unicompartmental arthroplasty is expected to increase significantly.