Katherine B. Vadasdi, MD

  • College: Dartmouth College, Hanover, NH
  • Medical School: Dartmouth Medical School, Hanover, NH
  • Residency: Hospital for Special Surgery, New York, NY
  • Fellowship: Orthopaedic Sports Medicine; Columbia University Medical Center, New York, NY
Director of the ONS Women’s Sports Medicine Center, Katherine Vadasdi, MD is an orthopedic surgeon who is fellowship trained in adolescent and adult sports medicine as well as shoulder and elbow surgery.

Dr. Vadasdi graduated from Dartmouth College and earned her medical degree at Dartmouth Medical School. She performed a residency in orthopedics at the Hospital for Special Surgery (HSS) in New York and completed fellowship training in shoulder, elbow and sports medicine at Columbia University Medical Center, Department of Orthopedics. While at Columbia she was assistant team physician to Columbia University Athletics.  Dr. Vadasdi has been honored as a Castle Connolly America’s Top Doctor and Regional Top Doctor annually since 2014.  In 2017, she was the recipient of the Fairfield County Doctor of Distinction Award and was named among the Exceptional Woman in Medicine by Castle Connolly. In 2019, Dr. Vadasdi was honored with a Women Who Inspire award from the Greenwich YWCA.


As member of the Board of Directors at the ONS Foundation for Clinical Research and Education, Dr. Vadasdi is active in ongoing research, including the current groundbreaking study to curb opioid addiction among teens and athletes. She has been published in numerous prestigious industry journals such as the Journal of Shoulder and Elbow Surgery and the Journal of Orthopaedic Trauma.

Additionally, Dr. Vadasdi serves as a mentor through the Foundation’s Research and Summer Internship Programs, including the Mini-Med School program, which provides 15 high school students the opportunity to participate in an orthopedic workshop.

Dr. Vadasdi is the designated team doctor for Greenwich Academy, Greenwich High School, Iona Preparatory School, Trinity Catholic High School and Convent of the Sacred Heart. She is a frequent guest speaker for local organizations, parent groups and at medical conferences. She participates on a number of committees and boards, including the Greenwich Hospital Women’s Health Initiative Board of Directors and the Hospital’s Peer Review Board.

Dr. Vadasdi’s area of medical specialty reflects her personal interests.  She is an accomplished triathlete, having completed Ironman competitions in 2007 and 2009. Dr. Vadasdi is also an alpine climber who has ascended Mount Kilimanjaro, Mount Rainier and the Grand Teton, among others.

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From the moment I walked in the ONS door with my broken right patella, I knew I was in the right place!  I was most fortunate to be referred to Dr. Vadasdi by two of her former patients. I immediately felt comfortable as she is an Ironwoman Triathlete and I am a 3 time Ironman.

The entire ONS group, from surgery to PT, has turned a most difficult situation into a pleasant one.  I am always greeted with a warm smile and never wait more than five minutes.  The staff at ONS took care of ALL my health insurance needs leaving me with my sole responsibility of showing up on time. I would highly recommend ONS to anyone in need of orthopedic care or PT. They are simply the best. This is from the heart as I am soooo grateful for ONS taking good care of me!! (patient S.W.)

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Joint Replacement Symposium


Dr. Vadasdi discusses The Opioid Crisis and Opioid Sparing Techniques in Surgery



American Academy of Orthopaedic Surgeons
American Orthopaedic Society for Sports Medicine
Ruth Jackson Orthopaedic Society
Connecticut Orthopaedic Society


Assistant Team Physician for Columbia University Athletics: 2008-2009


American Academy of Orthopaedic Surgery


Greenwich YWCA Women Who Inspire Award 2019
Castle Connolly Exceptional Women in Medicine, 2017 – 2019
America’s Most Honored Professionals 2019 – Top 1%
Castle Connolly Top Doctor 2014-2020
New York Metro Area’s Top Doctor, 2020
Doctor of Distinction, 2017 Female Trailblazer Award
Greenwich Magazine Fairfield’s Top Doctor 2013-2020
Stamford Magazine  Fairfield’s Top Doctor 2015-2020
Darien/New Canaan Magazine Fairfield’s Top Doctor 2015-2020
Fairfield Magazine Top Doctor 2015-2018
Westport Magazine Fairfield’s Top Doctor 2015-2018
40 Under 40 WAG/FFCBJ Award 2014


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