Marc S. Kowalsky, MD

  • College: Dartmouth College, Hanover, NH
  • Medical School: Tufts University School of Medicine, Boston, MA, MD / MBA in Health Management
  • Residency: Orthopaedic Surgery, Columbia University Medical Center / New York Orthopaedic Hospital, New York, NY
  • Fellowship: Sports Medicine, Lenox Hill Hospital / Nicholas Institute of Sports Medicine & Athletic Trauma, New York, NY
    Shoulder & Elbow Surgery, Washington University School of Medicine, Saint Louis, MO
Dr. Kowalsky is a board-certified orthopedic surgeon with expertise in surgical and nonsurgical treatment of rehab-focused, as well as operative treatments for upper and lower extremity sports injury, and complex shoulder and elbow conditions including degenerative disease, trauma, and revision surgery. He has a particular interest in the management of shoulder and elbow arthritis, instability, ligament and tendon injuries, as well as knee injuries and cartilage disorders. He has authored original research manuscripts, review articles, and textbook chapters focusing on AC joint reconstruction, rotator cuff repair, and shoulder replacement. He currently serves as a reviewer for the Journal of the American Academy of Orthopaedic Surgeons, Journal of Shoulder and Elbow Surgery and the American Journal of Sports Medicine.

Dr. Kowalsky has cared for college and professional athletes at every level of competition. He has provided sports medicine coverage for the Tournament of Champions Squash Tournament and the United States Open Tennis Championship. As a sports medicine fellow, he was an assistant team physician for the New York Jets and the New York Islanders. Dr. Kowalsky previously served as orthopedic surgery consultant for New York City Public School Athletic League Rugby and Play Rugby USA, and as the Medical Director of the New York Rugby Club Annual New York 7s Tournament. He currently serves as team physician for the USA Rugby National Team and locally for the White Plains Rugby Football Club, Iona College Rugby Football Club and the Greenwich High School Rugby Team.

Dr. Kowalsky earned his medical degree at Tufts University School of Medicine in Boston, MA, where he also received an MBA in Health Management. He completed his residency in orthopedic surgery at Columbia University Medical Center in New York, NY. He then completed two subspecialty fellowships, the first in sports medicine at Lenox Hill Hospital / Nicholas Institute of Sports Medicine and Athletic Trauma, and the second in shoulder and elbow surgery at the Washington University School of Medicine. Dr. Kowalsky has subspecialty certification in Sports Medicine by the American Board of Orthopaedic Surgery, and has been inducted as a member of the American Shoulder and Elbow Surgeons.

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Watch Dr. Kowalsky discuss sports injury prevention:


Professional Affiliations
American Shoulder and Elbow Surgeons
Diplomate, American Board of Orthopaedic Surgery
Fellow, American Academy of Orthopaedic Surgeons
Arthroscopy Association of North America
American Orthopaedic Society for Sports Medicine
Association of Clinical Elbow and Shoulder Surgeons

Sports Team Affiliations
Team Physician, Iona College Rugby Football Club: 2015-Present
Team Physician, White Plains Rugby Football Club: 2010-Present
Team Physician, USA Rugby National Team: 2013-Present

American Board of Orthopaedic Surgery – Board Certified
American Board of Orthopaedic Surgery – Subspecialty Certificate in Sports Medicine

New York Super Doctors, 2015
New York Super Doctors Rising Stars SM, 2013 – 2014 Patient Choice Award, 2012 – 2013
Best Fellow Research Presentation Award, Lenox Hill Hospital Department of Orthopaedic Surgery
Alexander Garcia, MD Senior Resident Award, New York Orthopaedic Hospital
Rosamond Kane, MD Pediatric Resident Award, New York Orthopaedic Hospital

Watch as Dr. Kowalsky discusses the specialty of Sports Medicine with Dr. Louis Bisogni.


Conroy C, Sethi P, Macken C, Wei D, Kowalsky MS, Mirzayan R, Pauzenberger L, Dyrna F, Obopilwe E, Mazzocca AD. “Augmentation of a Distal Biceps Repair with an Acellular Dermal Graft Restores Native Biomechanical Properties in a Tendon Deficient Model”. AJSM. (accepted for publication).

Ponzio DY, VanBeek C, Wong JC, Padegimas EM, Anakwenze OA, Getz CL, Abboud JA, ACESS Group. “Profile of Current Opinion on Arthroscopic Acromioplasty: A Video Survey Study”. Arthroscopy. 32(7): 1253-62, 2016 Jul.

Kowalsky, MS. “Minimally Invasive Treatment of Elbow Articular Cartilage Injury”. In: Minimally Invasive Surgery in Orthopedics, 2nd Ed. Scuderi GR, Tria AJ, editors. New York: Springer, New York; 2016: 1-16.

Kowalsky MS, Zuckerman JD. “Chronic Glenohumeral Dislocation: Anterior and Posterior”.  In Clinical Decision Support: Shoulder and Elbow.  Zuckerman JD, Oh L, Strauss E, ed. Decision Support in Medicine, LLC, Wilmington, DE.  2015.

Kowalsky, MS.  “SLAP Tears and Lesions of the Biceps Tendon”.  In AAOS Comprehensive Orthopaedic Review,  2nd  Ed. Boyer, MI, ed.  American Academy of Orthopaedic Surgeons, Rosemont, IL.  2014

Kowalsky MS, Galatz LM, Shia DS, Steger-May K, Keener JD.  “The relationship between scapular notching and reverse shoulder arthroplasty prosthesis design”.  JSES.  21(10): 1430-41, 2012 Oct.

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Conditions & Treatments Include:


  • Dr. Kowalski besides being very caring, professional and friendly did an amazing job putting our son’s broken humerus bone back together. The follow-up xrays revealed an amazing progress and almost seamless recovery. We are very grateful to Dr. Kowalski and his staff for taking such great care of our young athlete and enabling him to get back to skiing, training and competing in record time! (5 Star Review on Healthgrades from a patient in Darien, CT)

  • Dr. Kowalsky is the absolute best! Following a serious sport related injury (elbow), I was treated with the utmost professionalism and personal care. He talked me through every step of my recovery, checked in with me, was there when I had questions/worries about being able to return to full activities sports, etc. A year later, I needed emergency surgery (meniscus repair) which he did too. He took such amazing care of me! His level of expertise and personal involvement is unparalleled! (5 Star Review on Healthgrades from Steven D. in Greenwich, CT)

  • Dr. Kowalsky – I had my left meniscus repaired by you in October 2016 and my right meniscus repaired in April 2017. My desire was to get back into marathon running. I completed my 15th marathon on Sunday, January 7th at Walt Disney World thanks to you and your staff’s expertise and assistance. I can’t tell you how much I appreciate the ability to be back running. Again, thank you. (Dennis N., Greenwich, CT)

  • So much praise for Dr. K so I hope this will sum up who he is as a physician, surgeon & man. He knew I was pressed for time to get my meniscus repaired so he scheduled me first thing in the morning (also my preference). As I was leaving after recovery, I met him in the parking garage. He came in early to operate on me alone and then went on with the rest of his day! Who does that but a kind, compassionate, considerate human! Also, I came home with pics which he explained later. I’m eternally grateful! (5 star review on Healthgrades from Jessica C. in New York)

  • I had ACL surgery with Dr. Kowalsky and it went better than I would have hoped! I’m currently 5 months out of surgery and feel great. Thanks to Dr. Kowalsky and team for making me feel comfortable as well as answering all my questions along the way. (5 star review on Healthgrades)

  • Dr. Kowalsky performed ACL reconstruction on my knee and I couldn’t be more thrilled with the result! He’s an excellent surgeon, but also has superb bedside manager and is willing to spend whatever time is necessary for his patients to feel informed and cared for. He managed my expectations all through the process, from surgery through physical therapy. I’m cleared for skiing again and couldn’t be happier. (5 star review on Healthgrades from Karen in Norwalk, CT)

  • Dr. Kowalsky repaired my non union clavicle. I had a graft and 2 plates. I now have full range of motion on my shoulder. Dr. Kowalsky is a skilled surgeon and has a great bed side manner. He spends time with you and explains procedures every step of the way. I could not have asked for a better surgeon and doctor. (Five star review on Healthgrades from a patient in Weston, CT)

  • I had a complete tear in one of my rotator cuff tendons. I had gotten 2 opinions, one locally and the other in NYC. I had heard of very positive results at ONS through a relative and scheduled an appointment with Dr Kowalsky. It was an instant fit, I was ready to make my decision. Dr Kowalsky took time to go over my MRI and my injury in detail and also his surgical procedure to repair it. The recovery process was also explained so I knew what to expect. Great results and great doctor! (Five star review on Healthgrades from Althea in Easton, CT)


  • Dr. Kowalsky performed ACL reconstruction on my knee and I couldn’t be more thrilled with the result! He’s an excellent surgeon, but also has superb bedside manager and is willing to spend whatever time is necessary for his patients to feel informed and cared for. He managed my expectations all through the process, from surgery through physical therapy. I’m cleared for skiing again and couldn’t be happier. (Five star review on Healthgrades from Karen in Norwalk, CT)

  • Dr. Kowalsky took EXCELLENT care of my 12 year old son who needed shoulder surgery. He is an outstanding doctor from beginning to end. (5 Star review on Healthgrades by patient’s parent from Harrison, NY.)

  • Thanks to Dr. Kowalsky, my knee surgery was very easy. I had no pain and the recovery time was unexpectedly quick and easy! I did not have to take any painkillers. He really knows what he’s doing! Thank you Dr. Kowalsky! (comment from Health Grades)

  • I was so pleased with Dr. Kowalsky‘s professionalism. He was very thorough and spoke to me in “real talk” so that I understood what was going on with my shoulder. I also liked the fact that he told me if I had any questions or problems to feel free and call the office. I called him about a medication I was taking and his nurse got right back to me. I highly recommend Dr. Kowalsky. (comment from Health Grades)

  • I had a serious knee accident with 3 detached quad muscles at the age of 68. Dr. Kowalsky performed a surgical procedure to reattach them all. I’m able to ski and bike again! Recovery takes time but I’m very happy with the results. Thanks so much! (comment from Health Grades)

  • Thanks to Dr. Kowalsky my surgery went extremely well. I am mystified at how I am recovering faster than I had expected. (Patient Survey)

  • Dr. Kowalsky took the time to hear me explain the progression of my symptoms. He gave me a thorough exam, asked all of the right questions and gave a very logical diagnosis and treatment plan. I am very pleased. (Patient Survey)

  • Dr. Kowalsky and his staff were very accommodating and professional. (Patient Review)

  • Dr. Kowalsky is one of the best and most caring physicians you’ll ever find. It is a blessing to be his patient. Thank you! (Patient Survey)

  • As always, I was beyond happy with my ONS experience. My expectations for the treatment of my son were exceeded. This was our first time meeting Dr. Kowalsky and he was absolutely great! We were so well taken care of. Thank you! (Patient Survey)

  • Dr. Kowalsky has really done an excellent job for me. (Patient Survey)

  • Dr. Kowalsky:  It’s almost a year since I met you in Greenwich Hospital. I want to thank you for the wonderful care and kind bedside manner you showed me over the past year.  I’m so grateful you were the doctor on call that day. I don’t know how I would have gotten this far without your gentle manner.. I have the utmost respect for you.  Sincerely, SM

  • Dr. Kowalsky was kind and understanding of my desire to “get back” to rowing and dance. He took time to ask questions to understand my commitments to my teams and how important my attendance was at upcoming events. I appreciated his empathy and straight-forward options. He was a nice person too. – (Patient satisfaction survey)

  • It is always a great experience coming to see one the doctors here. The professionalism and great customer service keeps me coming back even though it is an hour drive for me! (Anonymous online patient satisfaction survey)

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