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Robert G. Marx, MD

Sports Medicine Surgeon
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About Dr. Marx


Dr. Robert Marx is an Orthopedic Surgeon at HSS and Professor of Orthopedic Surgery at Weill Medical College of Cornell University. He is Vice Chair of Orthopedic Surgery for faculty development at HSS. Dr. Marx has extensive experience in knee 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 Ultimate Fighting Championship (UFC) and The Juilliard School as well as a Team Physician for the New York Rangers.  

After graduating Université de Montréal with a BSc, Dr. Marx went on to medical school at McGill University, also in Montréal, Québec, Canada, and then completed his residency in orthopedic surgery at the University of Toronto in Toronto, Ontario, Canada. During his residency, Dr. Marx completed an MSc in Clinical Epidemiology, also at the University of Toronto. After his residency he was a sports medicine fellow for two years at HSS, focusing on knee and shoulder surgery.  

Dr. Marx has published over 300 peer-reviewed scientific articles and six books, including three relating to ACL injury and surgery. He is a Senior Associate Editor for the HSS Journal: The Musculoskeletal Journal of Hospital for Special Surgery.  

Dr. Marx has been invited to lecture at many academic institutions around the world, including Harvard University and the Mayo Clinic. He serves on the Executive Board of Directors of the International Society of Arthroscopy, Knee Surgery, and Orthopedic Sports Medicine (ISAKOS) as Second-Vice President and will serve as ISAKOS President for the 2027-2029 term.

Visiting surgeons from around the world travel to New York to observe Dr. Marx in the operating room. He also treats patients from across North America and overseas who travel to HSS specifically for their surgery. Dr. Marx enjoys speaking French with his international patients and colleagues.

For more information, visit www.robertmarxmd.com

Profile Video


Specialized Centers

Institute for Cartilage Repair
Performing Arts Medicine Collaborative

Special Expertise

ACL reconstruction and ACL revision surgery
Knee replacement
Knee ligament reconstruction
Knee arthroscopy
Knee osteotomy



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

Patient Stories


Patient ratings for Dr. Marx


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If your insurance is not listed, 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 Top Doctor, 15 Years 
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 Street. 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

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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).

The following animations demonstrate surgical techniques that may differ slightly from how Dr. Marx performs your procedure. The animations are informative guides but not exact reproductions of our surgical techniques.

Publications by Dr. Marx

Patient Education

Selected Journal Articles

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.


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 / Research Studies

Industry Relationships

Industry Relationships

HSS has a long history of supporting appropriate relationships with industry because they advance HSS's mission to provide the highest quality patient care, improve patient mobility, and enhance the quality of life for all, and to advance the science of orthopedic surgery, rheumatology, and their related disciplines through research and education.

Below are the healthcare industry relationships reported by Dr. Marx as of March 23, 2023.

  • Demos Health - Author 
  • HSS, LLC - Ownership Interest
  • HSS ASC of Manhattan, LLC - Ownership Interest
  • Mend Nutrition, Inc. - Advisory Board; Ownership Interest
  • Springer - Author

HSS and its physicians make this information available to patients and the public, thus creating a transparent environment for those who are interested in this information. Further, the HSS Conflicts of Interest and Commitment Policy prohibits physicians from collecting royalties on products they develop 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