Dr. Gregory S. DiFelice is a fellowship-trained orthopedic surgeon specializing in sports traumatology and joint reconstruction surgery at Hospital for Special Surgery and NewYork-Presbyterian Hospital. He also holds an appointment at Weill Cornell Medical College as an associate professor. Regional interests include the knee, shoulder and hip. He has particular interests in ligament reconstruction of the knee with extensive experience in multi-ligament reconstructions, cartilage and meniscal repair of the knee, arthroscopic shoulder surgery including labral and rotator cuff repairs, and arthroplasty of the knee, shoulder and hip. He frequently lectures on these interests both domestically and internationally.
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 orthopedic surgery at HSS. 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 for the Division of Sports Medicine and Joint Reconstruction Surgery for the North Bronx Healthcare Network, as well as an assistant professor of orthopedic surgery at the Albert Einstein College of Medicine. Prior to his recent return to HSS, he worked in conjunction with the Ranawat Orthopaedic Center at Lenox Hill Hospital.
Among his many accolades, Dr. DiFelice is also a member of numerous state and national medical societies. His athletic accomplishments are also numerous and range from Division I collegiate football to the US Rugby Super League and international rugby competitions. 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.
Associate Attending Orthopedic Surgeon, Hospital for Special Surgery
Associate Professor, Clinical Orthopedic Surgery, Weill Cornell Medical College
Associate Attending Orthopedic Surgeon, NewYork-Presbyterian Hospital
Ligament reconstruction of the knee
Cartilage and meniscal repair of the knee
Arthroscopic shoulder surgery
Labral and rotator cuff repairs
Arthroplasty of the knee, shoulder and hip
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
American Academy of Orthopaedic Surgeons
American Orthopaedic Society for Sports Medicine
American Association of Hip and Knee Surgeons
New York State Society of Orthopaedic Surgeons
Medical Society of the State of New York
Alpha Omega Alpha Medical Honor Society- NJ Beta Chapter
One of the goals of 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. 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 September 17, 2019.
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, the 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.
MD, UMDNJ- New Jersey Medical School, Newark, NJ/USA, 1994
Orthopedic Surgery, Hospital for Special Surgery, New York, NY/USA, 1999
Board Certified, ABOS, July 2003
New York, New Jersey
Contributing author. Review Questions in Orthopaedics, eds., Wright, JM, Millett, PJ, Crockett, HC;Lippincott, Williams & Wilkins. 2002.
Paletta GA, DiFelice GS, Meunier MM. “Elbow Injury in the Adolescent Athlete.” In: Altchek, DW, Andrews, JR eds; The Athlete’s Elbow, Lippincott, Williams & Wilkins. 2001: 231-248.
Lissy, Micah, Christopher J. Dy, Anil S. Ranawat, and Gregory S. Difelice. "Arthroscopic Primary Cruciate Repair in the Multiligament Injured Knee." The Multiple Ligament Injured Knee (2013): 193-210. Print.
Schottel P, Reinhardt K, DiFelice GS, Ranawat AS. Surgical Treatment of Traumatic Quadriceps and Patellar Tendon Injuries of the Knee. AAOS Atlas of Essential Orthopaedic Procedures. American Academy of Orthopedic Surgeons; 2013: 137-143. http://digital.aaos.org/atlas_section1/138?ajax
Nieves, Dominique D., Micah J. Lissy, and Gregory S. Difelice. "Arthroscopic Primary Repair of Posterior Cruciate Ligament Injuries." Posterior Cruciate Ligament Injuries (2015): 165-72. Print.
van der List JP, DiFelice GS. The Role of Ligament Repair in Anterior Cruciate Ligament Surgery. In: Mascarenhas R, Bhatia S, Lowe WR, editors. Ligamentous Injuries of the Knee. 1 ed. Houston: Nova Science Publishers; 2016. p. 199-220.
DiFelice GS, van der List JP. Arthroscopic suture anchor primary ACL repair. In: Insall and Scott Surgery of the Knee (6th edition).
van der List JP, DiFelice GS. Primary anterior cruciate ligament repair in paediatric patients. The Pediatric ACL: Clinical Evaluation and Management Strategies. 2017, in press.
van der List JP, DiFelice GS. Range of motion and complications following primary repair versus reconstruction of the anterior cruciate ligament. The Knee.
Jonkergouw, A.van der List JP, DiFelice GS. Multiligament Repair with Suture Augmentation in a Knee Dislocation with Medial-Sided Injury. Arthrosc Tech. 2018 Jul 16;7(8):e839-e843. https://doi.org/10.1016/j.eats.2018.04.006
van der List, JP, DiFelice GS. Primary Repair of the Medial Collateral Ligament with Internal Bracing.
Arthrosc Tech. 2017 Jul 3;6(4):e933-e937. https://doi.org/10.1016/j.eats.2017.03.003
van der List JP, DiFelice GS. Arthroscopic primary repair of the anterior cruciate ligament with suture augmentation. Arthrosc Tech. 2017, in press. https://doi.org/10.1016/j.eats.2017.06.009
van der List JP, DiFelice GS. Preoperative magnetic resonance imaging predicts
eligibility for arthroscopic primary anterior cruciate ligament repair. Knee Surg Sports Traumatol Arthrosc. 2017, in press. https://doi.org/10.1007/s00167-017-4646-z
van der List JP, DiFelice GS. Role of tear location on outcomes of open primary repair of the anterior cruciate ligament: a systematic review of historical studies. Knee. 2017;24(5):898-908 https://doi.org/10.1016/j.knee.2017.05.009
van der List JP, Mintz DN, DiFelice GS. The locations of anterior cruciate ligament tears in paediatric and adolescent patients: a magnetic resonance imaging study. J Pediatr Orthop. 2017. https://doi.org/10.1097/BPO.0000000000001041
van der List JP, DiFelice GS. Role of tear location on outcomes of open primary repair of the anterior cruciate ligament: a systematic review of historical studies. Knee. 2017. https://doi.org/10.1016/j.knee.2017.05.009
van der List JP, DiFelice GS. Range of motion and complications following primary repair versus reconstruction of the anterior cruciate ligament. Knee. 2017. https://doi.org/10.1016/j.knee.2017.04.007
van der List JP, DiFelice GS. Primary repair of the medial collateral ligament with internal bracing. Arthrosc Tech. 2017. https://doi.org/10.1016/j.eats.2017.03.003
van der List JP, Mintz, DN, DiFelice GS. The location of anterior cruciate ligament tears: a prevalence study using magnetic resonance imaging. Orthop J Sports Med. 2017 Jun;5(6):2325967117709966. https://doi.org/10.1177/2325967117709966
DiFelice GS, van der List JP. Regarding "Acute Proximal Anterior Cruciate Ligament Tears: Outcomes After Arthroscopic Suture Anchor Repair Versus Anatomic Single-Bundle Reconstruction". Arthroscopy. 2017 Apr;33(4):693-694. https://doi.org/10.1016/j.arthro.2017.01.028
van der List JP, DiFelice GS. Gap formation following primary anterior cruciate ligament repair: a biomechanical study. The Knee. 2017. https://doi.org/10.1016/j.knee.2016.10.009
Koenig JH, Ranawat AS, Umans HR, DiFelice GS. Meniscal Root Tears: Diagnosis and Treatment. Arthroscopy 2009; 25(9): 1025-32. 2009 Sep.
DiFelice, GS. “Surgical Technique: When to Arthroscopically Repair the Torn Posterior Cruciate Ligament”. Clinical Orthopaedics and Related Research. vol 470: 861-868. March 2012. (CORR Award)
DiFelice GS, Villegas C, Taylor S. Anterior Cruciate Ligament Preservation: Early Results of a Novel Arthroscopic Technique for Suture Anchor Primary Anterior Cruciate Ligament Repair. Arthroscopy.
For more publications, please see the PubMed listing.
Arthroscopic Primary Repair of Proximal Anterior Cruciate Ligament Tears: With or Without Additional Suture Augmentation? AOSSM Annual Meeting. San Diego, CA. July 5-7, 2018.
Arthroscopic primary repair of proximal anterior cruciate ligament tears:With or without internal brace? Poster presentation at the 18th Biennial Meeting of the European Society for Sports Traumatology, Knee Surgery and Arthroscopy, Glasgow, Scotland. May 9 – 12, 2018.
Good outcomes of arthroscopic primary repair of proximal anterior cruciate ligament tears are maintained at mid-term follow-up. Poster presentation at the 18th Biennial Meeting of the European Society for Sports Traumatology, Knee Surgery and Arthroscopy, Glasgow, Scotland. May 9 – 12, 2018.
The location of anterior cruciate ligament tears: a prevalence study using magnetic resonance imaging. Podium presentation at the 85th Annual Meeting of American Academy of Orthopaedic Surgeons, New Orleans, LA, USA. March 6 – 10, 2018.
DiFelice, GS. We can get ACL to heal-Techniques & results. Warwick Orthopaedics Sports Knee Conference. Staffordshire, UK. November 20-21, 2017.
Primary ACL Repair: Why We Don’t, Why We Should, and How I do It? 4th Joint Preservation Congress. Warsaw, Poland. September 14-16, 2017.
Case Presentation: Multi-Ligament Knee Reconstruction,Technique and Fixation DeviceChoices, Surgical & Patient Selection Tips for Successful Surgical Outcomes. Grand Rounds: Michigan State University. Grand Rapids, MI. May 16-17, 2017.
Emerging Technique: ACL Repair. 2017 Kaiser Permanente Dale Daniel Orthopaedic Symposium. Huntington Beach, CA. February 11, 2017.
The Incidence of Proximal Avulsion Anterior Cruciate Ligament Tears: A Magnetic Resonance Imaging Evaluation. E-poster presentation at 11th Biennial ISAKOS Congress. June 4 – 8, 2017, Shanghai, China.
Is There a Role for Primary Repair of ACL Injuries? National Capital Knee Symposium, University of Ottawa. Ottawa, Canada. September 15-16, 2016.
ACL Repair- is there a role? Fortius International Sports Injury Conference. London, UK. October 12-13, 2015.
Surgical Spotlight: Overview of Anterolateral Ligament. AOSSM Annual Meeting 2015. Orlando, FL. July 9-12, 2015.
Suture Anchor Versus Drill Tunnel Primary ACL Repair: An In Vitro Comparison of Gap Formation, ISAKOS Congress, June 7-11, 2015.
ACL Preservation: Early Results of A Novel Arthroscopic Technique of Suture Anchor Primary ACL Repair, AANA Annual Meeting, April 23-25, 2015.
Knee Injuries in Athletes: Getting Patients Back in the Game. Rosemont, IL. April 8-10, 2010. Invited Instructor.
Primary ACL repair, Primary ACL repair in children/adolescents, all inside reconstruction techniques, multi-ligamentous repairs and reconstructions
ACL injuries have become commonplace, along with its traditional treatment of reconstruction. According to Dr. Gregory DiFelice, orthopedic sports trauma surgeon at HSS, one size does not fit all for ACL tears. He has developed an innovative approach to repair the native ACL in tears where the ligament is largely intact, but has been torn from its bony attachment. His technique saves the patient's native anatomy which results in better outcomes. Watch exclusive footage of his patients who have undergone this technique, all of which are included in the new results that Dr. DiFelice just published. To view the study, please visit: http://www.sciencedirect.com/science/article/pii/S0749806315006647.