The procedure is new. Though surgeons have studied the approach the studies are recent and have replicated (repeated and verified) by only a few groups of surgeon-scientists. These studies give some insight into which patients and patterns of arthritis are most suitable for this procedure the relative novelty of the approach it is likely that as time passes we will discover more about the risks and shortcomings of this technique. Also even an experienced knee replacement surgeon will have performed many more surgeries through the traditional approach than through the less-invasive method; we know that the more procedures one does the more reliable the results are.
Unicompartmental knee replacement. Approximately 30 percent of people with knee osteoarthritis have disease that is largely restricted to one area of the joint. In these cases, unicompartmental knee replacement (also called partial knee replacement) may offer the same improvement and function as total knee replacement but with less trauma and better range of motion. A 2007 review that compared unicompartmental knee replacement with total knee replacement found a similar improvement in function, but fewer complications and less need for revision surgery after unicompartmental surgery.