Dr. Klion performs the newest techniques for Knee, Shoulder, and Hip arthroscopy including cartilage repair, regeneration, meniscal transplantation, and labral repairs Dr. Klion has extensive experience with arthroscopic rotator cuff repairs and shoulder stabilization procedures. He has extensive experience in fracture care and management.


Dr. Klion an avid endurance athlete has  participate in 11 Ironman triathlons including Hawaii Ironman 2000 and 2001. He has completed 15 marathons in addition to many ultra-distance running and biking races. He serves as the Medical Director for the New York City Triathlon. He has published numerous articles on sports medicine issues and has appeared on both regional and national radio and television programs. He is active in the triathlon and endurance community providing lectures about sports medicine related issues to local clubs and groups.

Dr. Klion is the co-author of Triathlon Anatomy, published by Human Kinetics 2102. Along Troy Jacobson, world renown triathlon coach, the book helps any triathlete maximize strength, power, speed and endurance while preventing injury. www.humankinetics.com

He along with Dr. James Capozzi created a DVD Home Rehabilitation Series entitled  BodyworksMD.

Dr. Klion was a founding member of TRIARQ, a community of Physicians, Physical Therapists, Patients, and other healthcare professionals working together to create new standards in clinical and service excellence through continuing education, research, and cross discipline collaboration.

Castle Connolly Top Doctors 2019: Mark J. Klion, MD Castle Connolly Top Doctors 2020: Mark J. Klion, MD


Dr. Klion has been recognized by Castle Connolly as a Top Doctor in 2014, 2016, 2017, 2018, 2019, and 2020
Castle Connolly NY Metro Area Top Doctors 2/1/15
Castle Connolly Top Doctor 2014
Super Doctors 2013,2015,2016

Board Certifications

Board Certified in Orthopedic Surgery (ABOS)


Director of Orthopedics St. Barnabas Hospital
Clinical Instructor Mount Sinai Department of Orthopedics
Attending Lenox Hill Hospital
Partner Midtown Surgery Center


Clinical Areas of Interest

- Sports Medicine
- Arthroscopy of the shoulder, hip, knee, and ankle
- Shoulder dislocations, labral tears, and rotator cuff tears
- Knee meniscus and ligament injuries
- Hip labral tear- Fractures around ankle, knee, and shoulders

Practice Locations

New York, NY

159 East 74th Street
New York, NY 10021
(212) 737-3301

Scarsdale, NY

2 Overhill Road
Suite 310
scarsdale, NY 10583
(914) 725-6970


Book Online


Mark Klion has been helping triathletes optimize their performance and stay injury free for decades. I've raced side by side with Dr. Klion at the Ironman in Kona, Hawaii. I've also visited his Manhattan office for treatments and advice that kept me at the top of my game.

Christopher Bergland, World-class Endurance Athlete who Broke a Guinness World Record for Treadmill Running

Having combined experience of more than 50 years of training and treating endurance athletes of every level, Dr. Mark Klion and Jonathan Cane (co-author of Triathlon Academy) know exactly what it takes to achieve optimal performance.

Victoria Brumfield, Chief of Staff for USA Triathlon

Dr. Klion and his staff are exceptional. My son broke his arm and because it was his first break we had to randomly select an Ortho. Luckily we picked this one. The office is run very efficiently with a friendly front desk crew. X-ray was done immediately and then right in to see Dr. Klion. I anticipated a long wait, but Dr. Klion's staff were a well oiled machine. We were in and out in no time.

Dr. Klion was not rushed and had a sense of humor while still very professional. We’ve had two additional follow-ups which were easy to schedule through the online patient portal.

Great communication, friendly and knowledgeable staff, and a healthy arm after a break. I’d highly recommend this practice.


Dr. Klion did an excellent job on my meniscus tear in my knee. He was averse to immediately recommend surgery and had me do physical therapy for 6+ months. When it became clear surgery was necessary, he quickly scheduled me, surgery went very smoothly, great recovery and he closely monitored my rehab. Surgery was mid-November and I ran a trail ultra-marathon by early May. Now I'm 2 years out and can hardly remember which knee he fixed.