Gregory S. DiFelice, MD

drdifelice-sGregory S. DiFelice, MD

Sport Traumatology & Joint Preservation Surgery

Dr. Gregory S. DiFelice is a fellowship-trained orthopaedic surgeon specializing in Sports Traumatology and Joint Reconstruction Surgery at Hospital for Special Surgery and New York Presbyterian Hospital. He also holds an academic appointment at the Weill Medical College of Cornell University as an Assistant Professor. His main surgical focus is on treatment of the knee, shoulder and hip. Using both non-surgical and surgical methods, he strives to utilize the latest technologies to improve patient outcomes, while preserving their native tissues. His customized approach to patient care is to use surgery as a last resort, and if absolutely necessary to perform the most conservative surgery that will obtain the best, most long-lasting results for the patient.

Dr. DiFelice is a surgical innovator and has developed several cutting edge surgical techniques that allow him to save a patients torn ligaments, rather than replacing them that is the current standard of care. The concept is called Ligament Preservation, and includes conservative, minimally invasive techniques such as Primary Repair and Primary Repair with Augmentation. By saving the patients native ligament tissues, a concept that the majority of Sports Medicine surgeons still believe is not possible, he greatly reduces surgical injury to the patient, thus diminishing the recovery time and restoring more of the natural function of the knee. Currently, for 50-75% of his ACL injured patients, he is able to save most, if not all of the patients’ native tissue thereby diminishing the need for grafts. He uses ACL Reconstruction, that is considered the standard approach throughout the world, only as a last resort when there is little to no tissue available to save. As the surgical innovator of his modern day preservation approach, he has lectured extensively both domestically and internationally on this and other topics. More can be learned about this topic on his website.

Admittedly, not all ligaments, nor all joints for that matter can be saved, and Dr. DiFelices’ conservative approach to surgery is also evident in his approach to arthritic joints. Rather than the majority approach, that everyone with arthritis gets a joint replacement surgery, his approach is more nuanced and customized for each patient, their health, activity level and particular pattern of arthritis. He is an expert in both realignment osteotomy and robotic unicompartmental arthroplasty, two techniques that allow the patient to avoid the larger, more morbid total joint arthroplasty when in their best interests. However, he is also an expert in both total hip and total knee arthroplasty having performed thousands of these procedures over his 15 year career.

Dr. DiFelice was born and raised in northern New Jersey. He completed his undergraduate degree at Princeton University while simultaneously earning 3 Varsity letters playing football. He then continued on to New Jersey Medical School, where he graduated as a member of the Alpha Omega Alpha Medical Honor Society. He did his residency in Orthopaedic Surgery at the Hospital for Special Surgery in New York City. He then completed a fellowship in Sports Medicine at Washington University in St. Louis in 2000. While there, he worked as an assistant to the team physicians for the St. Louis Rams, the St. Louis Blues and the St. Louis Cardinals.

Since finishing his training, Dr. DiFelice has been the creator and Director of the Division of Sports Medicine and Joint Reconstruction Surgery for the North Bronx Healthcare Network. Prior to his return to the Hospital for Special Surgery in 2010, he also worked in conjunction with the Ranawat Orthopaedic Center at Lenox Hill Hospital for five years.

Among his many accolades, Dr. DiFelice is a member of numerous state and national medical societies. His athletic accomplishments are also numerous and range from State Regional Champion High School baseball , to Division I collegiate football, to domestic and international Rugby player to Alpine Ski Instructor. As such, patients of his can take comfort in knowing that they are not only being treated by an esteemed physician, but a fellow athlete as well.


  • Assistant Attending, Hospital for Special Surgery Assistant Professor, Weill Cornell Medical College Assistant Attending, New York Presbyterian Hospital


Special Expertise

  • Ligament reconstruction of the knee, multi-ligament reconstructions, cartilage and meniscal repair of the knee, arthroscopic shoulder surgery, labral and rotator cuff repairs, arthroplasty of the knee, shoulder and hip


  • Patient Choice Award -, 2008 & 2009
    America's Top Orthopedists - Consumer Research Council of America, 2008 & 2009
    Teacher of the Year Award - Montefiore Orthopaedic Residency Program 2002 & 2005


  • Princeton University
    Rutgers University Medical School
    Hospital for Special Surgery
    New York Presbyterian Hospital
    Lenox Hill Hospital
    Washington University Orthopaedic Surgery (St Louis)
    Xavier High School
    New York Athletic Club
    St Louis Rams
    St Louis Cardinals
    St Louis Blues
    American Academy of Orthopedic Surgery
    Arthroscopy Association of North America
    American Orthopedic Society for Sports Medicine
    Play Rugby USA
    Winged Foot Rugby Foundation
    American Association of Hip and Knee Surgeons


  • Knee Arthroscopy, Shoulder Arthroscopy, Knee Ligament Reconstruction & Repair, Meniscal & Cartilage Surgery, Rotator Cuff Repair, Joint Replacement Surgery of the Knee, Hip & Shoulder, Fracture Surgery, Tendon Repairs

Insurances Accepted

  • Aetna
    Blue Cross HMO POS
    Blue Cross PPO
    United Healthcare

    If your particular insurance plan is not listed, you may still have coverage subject to the availability of 'out-of-network' benefits. Please do not hesitate to contact our office if you have questions regarding your insurance coverage.

Industry Relationships

  • One of the goals of Hospital for Special Surgery (HSS) is to advance the science of orthopedic surgery, rheumatology, and related disciplines for the benefit of patients. Physicians at HSS may collaborate with outside companies for education, research and medical advances. HSS supports this collaboration in order to foster medical breakthroughs; however HSS also believes that these collaborations must be disclosed.

    As part of the disclosure process, this website lists physician collaborations with outside companies if payments were received during the prior year, or if the HSS physician currently receives payment. The disclosures are provided by information provided by the physician and other sources and are updated regularly. Further information may be available on individual company websites.

    Below are the healthcare industry relationships reported by Dr. DiFelice as of March 26, 2015.

    • Arthrex, Inc. - Consultant

    By disclosing the collaborations of HSS physicians with industry on this website, HSS and its physicians make this information available to their patients and the public, thus creating a transparent environment for those who are interested in this information.

    Further, HSS’ Conflicts of Interest Policy does not permit physicians to collect royalties on products developed by him/her that are used on patients at HSS.

    Patients should feel free to ask their HSS physicians questions about these relationships.