Minimally invasive total knee arthroplasty (MIS TKA) has evolved over the years as an alternative to traditional approaches. These limited approaches have the advantage of diminished postoperative morbidity, less postoperative pain, decreased blood loss, and earlier functional recovery. However, the key to success is optimizing patient selection and paying specific attention to the operative details. The surgical technique and principles have not changed from the standard approach, but it is performed in a surgical field with limited visibility and modified instrumentation. Unicompartmental knee arthroplasty has recently enjoyed resurgence in popularity. Patients with isolated one-compartment disease and no associated ligamentous instability are good candidates for this limited arthroplasty procedure. The use of navigation may improve visualization and accuracy in less invasive surgical techniques and may provide useful intraoperative information