“MIS” refers to a variety of minimally invasive, total or partial knee surface replacements, fixed or mobile, designed to reduce the trauma from surgery and allow the patient to walk with full weight bearing on the same day as the surgery. No general anesthesia is necessary, and post-operative pain is reduced. The type of prosthesis used is selected to best serve the purpose of the patient. The goal is a pain-free, fully functional, long lasting result.