Dr. William Unis is an Orthopedic Surgeon practicing at NewYork-Presbyterian Medical Group Westchester located in Bronxville, NY. He graduated from University of Ottawa Faculty of Medicine and has been practicing for 42 years. Some of his areas of interest treated are adult hip arthritis, hip disease, joint replacement surgery, knee disorders, knee injuries, hip bursitis, sports injuries and a list of others. Dr. Tsirlin is affiliated with NewYork-Presbyterian Lawrence Hospital and was the Director of Orthopedic Surgery at NewYork-Presbyterian Lawrence Hospital from 1990-1999.