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Robert G. Marx, MD

Sports Medicine

About Dr. Marx


Dr. Robert Marx is an Attending Orthopedic Surgeon at HSS and Professor of Orthopedic Surgery at Weill Cornell Medical College. He is also Vice Chair of orthopedic surgery for faculty development at HSS. Dr. Marx has extensive experience in knee and shoulder surgery, with particular interest in ACL surgery, complex knee ligament reconstruction, and knee replacement. He has been voted as one of the “Best Doctors in New York” by New York Magazine for multiple years. Dr. Marx is the Head Consulting Orthopedic Surgeon for the Ultimate Fighting Championship (UFC) and The Juilliard School. He is a Team Physician for the New York Rangers.

Dr. Marx received his MD from McGill University, his MSc in Clinical Epidemiology from the University of Toronto, and his BSc in Biology from the Université de Montréal. He completed his post-graduate training in Orthopedic Surgery at the University of Toronto and completed a fellowship in sports medicine at Hospital for Special Surgery, focusing on knee and shoulder surgery.

Dr. Marx is Deputy Editor for Sports Medicine for the Journal of Bone & Joint Surgery. He has published over 300 peer reviewed scientific articles and five books, including three relating to ACL injury and surgery.

As an educator, Dr. Marx has been invited to lecture at many academic institutions around the world, including Harvard University and the Mayo Clinic. Dr. Marx serves on the Executive Board of Directors of the International Society of Arthroscopy, Knee Surgery, and Orthopedic Sports Medicine (ISAKOS) and is currently the society’s Newsletter Editor.

For more information, visit www.robertmarxmd.com


Special Expertise

ACL reconstruction and ACL revision surgery
Knee replacement
Knee ligament reconstruction
Knee arthroscopy
Knee osteotomy
Shoulder surgery for dislocation
Rotator cuff repair



ACL reconstruction and revision ACL surgery 
Meniscus surgery 
Multiligament knee reconstruction 
Knee osteotomy
Knee replacement
Patellar instability 


Dislocation repair and stabilization  
Rotator cuff surgery 
Impingement surgery

Patient Stories


Patient ratings for Dr. Marx


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Please call our office if you have questions regarding your insurance coverage. If you have out of network benefits, then your insurance may reimburse you for a portion of your office visit. We will work with you and your insurance to minimize your out-of-pocket costs. Financial assistance may be available for patients in need.



Attending Orthopedic Surgeon, Hospital for Special Surgery
Professor of Orthopedic Surgery, Weill Cornell Medical College
Professor of Public Health, Weill Cornell Medical College
Attending Orthopedic Surgeon, NewYork-Presbyterian Hospital


American Board of Orthopedic Surgery
Royal College Surgeons of Canada


Castle Connolly America's Top Doctors, 2012-2020
Castle Connolly Top Doctors in New York Metro Area, 2008-2022
New York Magazine Top Doctors, 2011-2022
Herodicus Award, “The Fate of Meniscus Tears Left in situ at the time of Anterior Cruciate Ligament Reconstruction: A 6-Year Follow-up Study from the MOON Cohort,” 2015
Eastern Orthopaedic Association’s Ranawat Award, “Cost Effectiveness Of Bariatric Surgery Prior To Primary Total Knee Arthroplasty,” 2014
O’Donoghue Sports Injury Research Award, “Revision Anterior Cruciate Ligament Reconstruction Graft Choice Impact on Outcome in the MARS Cohort,” 2014
Best Paper Award, awarded at the 12th International Congress for Shoulder and Elbow Surgery: Shoulder Program Oral Presentation, “Defining Indications for Rotator Cuff Repair: Predictors of Failure of Nonoperative Treatment of Chronic, Symptomatic, Full-Thickness Rotator Cuff Tears,” 2013
AOSSM Excellence in Research Award, “Development and Validation of a Pediatric Sports Activity Rating Scale,” 2013
3rd Annual HSS Patient Safety Champion Award, 2012 
O’Donoghue Sports Injury Research Award: The Effect of ACL Reconstruction on the Risk of Knee Reinjury, 2003 
ACL Study Group Research Grant (Principal Investigator), 1999 
D.R. Wilson Teaching Award, University of Toronto, 1998


BSc, Université de Montréal, Montréal, Québec, Canada
MD, McGill University, Montréal, Québec, Canada
MSc, Clinical Epidemiology, University of Toronto, Toronto, Ontario, Canada


University of Toronto, Toronto, Ontario, Canada


Sports Medicine/Shoulder and Knee Surgery, Hospital for Special Surgery, New York

State Licensure


English, French

For My Patients

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Directions to The Pavilion

My office is located at The Pavilion, 541 East 71st St. The main entrance to The Pavilion is on the north side of 71st Street underneath the sky bridge that connects the main hospital to the Belaire Building.

Pavilion map Please see directions from other HSS locations:

  • From the Main Hospital (535 East 70th St):
    Enter the Hospital lobby and take the West elevators to the 2nd Floor. Upon exiting the elevator, turn right and continue down the hallway and over the sky bridge. Once across the sky bridge, you will see a set of elevators on your left. Take the elevator to my office.
  • From the Belaire Building Main Entrance (525 East 71st St):
    Enter the Belaire lobby and take the front elevators to the 2nd Floor. Upon exiting the elevator, turn left and follow the hallway around until you see another set of elevators on your right. Take the elevator to my office.
  • From the Belaire Building 72nd Street Entrance (524 East 72nd St):
    Enter the Belaire building and walk down the stairs. Follow the hallway around, past the first set of elevators on your left. Continue down the hall and past the windows until you see another set of elevators on your right. Take the elevator to my office.
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Surgical Locations

Dr. Marx performs surgery at the following locations:

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Dr. Marx sees patients in Manhattan and the HSS Westchester outpatient center. Additionally, he operates at the Main Hospital at 535 East 70th Street and at HSS ASC of Manhattan located at 1233 2nd Avenue (and 65th Street).

Publications by Dr. Marx

Patient Education

Blog Posts

Selected Books/Chapters

The ACL Solution book cover

The ACL Solution (seen above), Prevention and Recovery for Sports' Most Devastating Knee Injury, Robert G, Marx, MD, Grethe Myklebust, PT, PhD, Brian W. Boyle

Dr. Marx has also authored a textbook on ACL injury prevention, a book on ACL surgery, another on revision ACL reconstruction, a textbook on bone tumors, as well as a book on methods for orthopedic clinical research.

Selected Journal Articles

Dr. Marx has authored over 275 peer-reviewed scientific articles and over 175 national and international presentations.

MOON Knee Group. Anterior Cruciate Ligament Reconstruction in High School and College-Aged Athletes: Does Autograft Choice Influence Anterior Cruciate Ligament Revision Rates? Am J Sports Med. 48(2):298-309, 2020. 

Westermann RW, Spindler KP, Huston LJ; MOON Knee Group, Wolf BR. Outcomes of Grade III Medial Collateral Ligament Injuries Treated Concurrently With Anterior Cruciate Ligament Reconstruction: A Multicenter Study. Arthroscopy. 35(5); 1466-1472, 2019.  

MARS Group, Wright RW, et al. Physiologic Preoperative Knee Hyperextension Is a Predictor of Failure in an Anterior Cruciate Ligament Revision Cohort: A Report from the MARS Group. Am J Sports Med. 46(12):2836-2841, 2018.

Houck DA, Kraeutler MJ, Vidal AF, McCarty EC, Bravman JT, Wolcott ML; MOON Knee Group. Variance in Anterior Cruciate Ligament Reconstruction Graft Selection based on Patient Demographics and Location within the Multicenter Orthopaedic Outcomes Network Cohort. J Knee Surg. 31(5):472-478, 2018.

MOON Knee Group, Wright RW et al. Ten-Year Outcomes and Risk Factors After Anterior Cruciate Ligament Reconstruction: A MOON Longitudinal Prospective Cohort Study. Am J Sports Med. 46(4):815-825, 2018.

For more publications, please see the PubMed listing.


Dr. Marx is at the forefront of orthopedic research as an investigator and also in his role as Deputy Editor of Sports Medicine for the Journal of Bone and Joint Surgery. In the latter capacity, Dr. Marx reviews manuscripts submitted to the journal and determines suitability for publication based on study strength, novelty of results, clinical impact, and relevance to readers. Dr. Marx is also Associate Editor for Evidence Based Orthopedics for the Journal of Bone and Joint Surgery. In this role, Dr. Marx assigns manuscripts' level of evidence based on study design.  Additionally, on a quarterly basis, he selects impactful randomized clinical trials that have been recently published and invites experts from around the world to write commentaries on these studies.

Dr. Marx's research interests are knee surgery. He has published extensively with the multicenter initiatives Multicenter Orthopaedic Outcomes Network (MOON) and Multicenter ACL Revision Study (MARS) looking at predictors of outcome following ACL reconstruction and revision ACL reconstruction, respectively.

Dr. Marx received the 2014 and 2017 O'Donoghue Sports Injury Research Award presented by AOSSM for studies outcomes after ACL reconstruction, as well as the effect of graft choice on revision ACL reconstruction outcomes. He also received the 2013 Excellence in Research Award presented by the American Orthopedic Society for Sports Medicine (AOSSM) for his development and validation of a pediatric sports activity rating scale.

Dr. Marx has received many peer-reviewed research grants. He was awarded The ISAKOS Clinical Outcomes Grant to study how to implement ACL injury prevention programs. Additionally, Dr. Marx was awarded a four million dollar, five year grant as a lead investigator for a study of outcomes after joint replacement surgery, funded by the United States government (Agency for Healthcare Research and Quality). He has also received funding from the NIH for clinical studies on knee arthroscopy for meniscal tears as well as for outcomes of ACL surgery.

Clinical Trials

Industry Relationships

Industry Relationships

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. Marx as of November 18, 2019.

  • Demos Health - Author; Book Royalties 
  • Journal of Bone & Joint Surgery - Editorial Board member
  • Mend - Science Advisory Board member; Ownership interest
  • Springer - Editor; Book Royalties 

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.

Dr. Marx in the News