Dr. O N Nagi is a Joint Replacement Specialist and the director of the joint replacement center at the Sir Ganga Ram Hospital in New Delhi. He is a graduate from Oxford University (UK) and served as prof. & head department of orthopedic surgeon at PGI Chandigarh. Dr. Nagi has made a significant contribution in the field of joint replacement surgery & trauma. He has performed more than 6000 joint replacement since 1981. His pioneer work on fracture neck of femur is well known internationally and is quoted in western textbooks "he is the only surgeon to be awarded the lifetime achievement award by the Indian Council of Medical Research (ICMR)" in addition to numerous prestigious oration awards given by various national and international organization. Dr. Nagi has more than 250 published articles to his credit in various international and national scientific journals.