Dr. Marx has treated thousands of knee and shoulder injuries. He does arthroscopic and open procedures for knee and shoulder problems as well as knee and shoulder joint replacement surgery. Dr. Marx also performs complex and revision surgical cases.

This includes surgery to stabilize shoulders following dislocation or fractures after trauma. Dr. Marx specializes in revision surgery for failed dislocation repairs.

Dr. Marx performs rotator cuff repair surgery arthroscopically for small and large tears to eliminate pain and improve strength in injured shoulders. The arthroscopic approach involves four small incisions each measuring less than a centimeter.

Dr. Marx performs knee arthroscopy with meniscus surgery and meniscus transplantation. Dr. Marx repairs or removes torn sections of the meniscus arthroscopically. He also performs osteotomy (leg realignment), transplants and complex knee-revision surgery.

Using arthroscopic technique, Dr. Marx reconstructs the anterior cruciate ligament of the knee (ACL). These injuries are often caused by sports injuries. He uses all techniques and graft sources, including patellar tendon, hamstrings and transplant. He also performs revision surgery for failed ACL reconstruction.

These procedures are performed for arthritic joints when pain and limitation of movement prevent normal function. Joint replacement surgery can allow patients who are limited by their arthritis to return to a more active and normal lifestyle.

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Dr. Marx is certified by the American Board of Orthopedic Surgery and the Royal College of Surgeons of Canada. 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 residency at the University of Toronto and obtained a fellowship in Sports Medicine/Shoulder and Knee Surgery from the Hospital for the Special Surgery.

Dr. Marx is Director of the Foster Center for Clinical Outcome Research at the Hospital for Special Surgery and Associate Professor of Orthopedic Surgery and Public Health at the Weill Medical College of Cornell University.

Dr. Marx currently serves on the Editorial Advisory Board of Muscle and Fitness Magazine and on the Scientific Advisory Committee of the International Society of Arthroscopy, Knee Surgery and Orthopedic Sports Medicine (ISAKOS). Comprised of surgeons from over 70 countries worldwide, ISAKOS develops, supports and promotes charitable, scientific and literary works regarding arthroscopy, knee surgery and orthopedic sports medicine.

Dr. Marx has been invited to lecture in Austria, Canada, Greece, Italy, Switzerland and New Zealand, where he has shared his knowledge on advanced orthopedic topics with hundreds of physicians and health care professionals. He has been invited to lecture as visiting professor of orthopedic surgery at many academic institutions, including Harvard University and The Mayo Clinic.

Dr. Marx has had visiting surgeons from around the world observe his work in the operating room, including from Argentina, Belgium, Brazil, Canada, China, France, Germany, Greece, India, Ireland, Israel, Italy, Japan, Lithuania, Poland, Spain, and Turkey. He also treats patients from many countries who travel to New York for their surgery. Dr. Marx enjoys speaking French with his international patients and colleagues.

Dr. Marx has published a textbook on bone tumors and has also written book chapters on knee surgery and should replacement surgery. He has published more than 60 peer-reviewed articles in leading orthopedic and research journals. Dr. Marx received the 2003 O'Donoghue Sport Injury Research Award presented by the American Orthopedic Society for Sports Medicine for a study of determinants of knee injury following anterior cruciate ligament (ACL) tear. Currently, he serves on the Editorial Advisory Board of Muscle and Fitness Magazine and also contributes articles regularly.

Dr. Marx has received many peer-reviewed research grants. He was awarded research funding from the ACL Study Group (an international nonprofit organization dedicated to the study of the anterior cruciate ligament) and the MacArthur Foundation to study Cartilage Regeneration and Repair. Additionally, Dr. Marx served a five year term reviewing grants from other surgeons for the Orthopedic Research and Education Foundation (OREF), the nation's largest nonprofit orthopedic research granting agency. Recently, 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).