Hospital for Special Surgery (HSS) is a hospital in New York City that specializes in orthopedic surgery and the treatment of rheumatologic conditions. Founded in 1863 by James Knight, HSS is the oldest orthopedic hospital in the United States. The hospital has been ranked the top orthopedic hospital in the United States by U.S. News & World Report for 11 consecutive years. HSS has a staff of over 4000 employees, including more than 200 physicians and surgeons, and treats over 32,000 inpatients and 300,000 outpatients annually.