The option to replace a knee joint severely compromised by arthritis with minimally invasive surgery (MIS) is available to more people than ever. Are you a candidate? First, a primary-care physician or an orthopaedic surgeon has to determine that you need a knee replacement and that there has not been severe bone loss. If you havent had open knee surgery on the same knee and if your weight is proportionate to your height, MIS may be your best option. For those who fit the profile, there are definite advantages. The most apparent and appealing-and perhaps the least important-is a smaller incision and resulting scar.