185 veterans with chronic knee pain and advanced knee osteoarthritis will be recruited to participate in this study designed to test the effectiveness of a special type of electrical acupuncture called periosteal stimulation (PST). Participants will be divided into three groups. They will receive PST or a control condition once a week for 10 weeks. Two-thirds of the participants will receive booster sessions periodically over the course of the next 6 months. Everyone will be called monthly during the 6 month period and then will be asked to return for an evaluation on site at the end of this period.