Dr. Douglas Unis is the director of the Adult Reconstructive Surgery Division in the Department of Orthopedic Surgery at Mount Sinai St. Luke's Roosevelt. He is a board-certified orthopedic surgeon specializing in minimally invasive hip and knee replacement surgery. Dr. Unis is one of a select group of surgeons in the US who performs anterior total hip replacement surgery, in which no muscle or tendon is cut and which requires no post-operative dislocation precautions. He was one of the first in the New York metropolitan area to perform this procedure. Other interests include complex revision hip and knee reconstruction. In addition to performing surgery, he serves as an assistant clinical professor of orthopedic surgery at Columbia University College of Physicians and Surgeons and participates in clinical research related to hip and knee reconstruction.