The knee joint can become inflamed and painful for a number of different reasons. Sometimes traditional injections do not provide pain relief that lasts for a long enough period of time. In these situations, a radiofrequency ablation- also called rhizotomy- procedure may be the better option for long-term pain relief. Radiofrequency ablation uses an electric current to heat up a small section of the nerve that goes to the facet joint in order to stop the pain signal. This minimally invasive procedure can provide relief that will last for months for people with chronic pain due to arthritic joints.