ONS Stamford

ONS Physician offices and Physical Therapy Center*
5 High Ridge Park, 3rd floor, Stamford, CT 06905

Patient parking is located behind the building.  Handicap parking is located on the lower level.  Follow the sign for Patient Drop Off.
Make an appointment online, or call 203-869-1145.

Physicians Hours
Monday- Friday, 8:00 am – 5:00 pm

Physical Therapy Hours*
Monday – Thursday, 6:30 am – 7:30 pm
Friday, 6:30 am – 5:30 pm
Saturday, 7:00 am to 12:00 pm
*NOTE: The last PT appointment in the day is scheduled 1 hour prior to closing.

Stamford MRI Center
The MRI Center is located on the first floor at 5 High Ridge Park in Stamford.
ONS Stamford MRI has a separate entrance on the Ground Floor behind the building, adjacent to the main entrance.

ONS Urgent Ortho Care Hours
Monday – Friday, 8:00 am – 12:00 pm, 1:00 pm – 5:00 pm

ONS in Stamford

ONS Physicians in Stamford

Matthew Cantlon, MD 

Hand Wrist & Elbow

James Cunningham, MD

Sports Medicine, Shoulder & Knee

Demetris Delos, MD

Sports Medicine, Shoulder & Knee

Tim Greene, MD

Sports Medicine, Hip & Knee

Steven E. Hindman, MD

General Orthopedics, Trauma

Marc Kowalsky, MD

Sports Medicine, Shoulder, Elbow & Knee

David P. Nocek

General Orthopedics, Trauma

Sean Peden, MD

Foot & Ankle

Christopher Sahler, MD

Interventional Physiatry, Sports Medicine, EMG

Scott Simon, MD


Katie Vadasdi, MD

Sports Medicine, Shoulder, Elbow & Knee

Mark Vitale, MD

Hand, Wrist & Elbow

Stamford Physical Therapists

New Patients

New Patients or patients who have not visited ONS in more than a year, please arrive 15 minutes prior to your scheduled appointment time to complete your registration, or save time by completing the forms online through the Patient Portal.  Also, please also bring the following to your appointment:

  • Insurance card

  • List of current medications and medical conditions

  • Primary-care physician address and phone, and contact information for other physicians involved with your care

  • Recent diagnostic images such as CTs, MRIs, x-rays, bone scans, or EMGs. Bring both original films and copies of reports