ONS Stamford

COVID-19 Appointment Policy

  • All patients and staff are temperature and symptom screened upon arrival to the office.
  • Patients and visitors must wear face covering to all appointments.  If you arrive for your appointment without a face mask you will be asked to reschedule your appointment.
  • Patients may bring one guest to their appointment.
  • Children may be accompanied by one parent. 
  • Waiting areas have been redesigned for socially distancing.  You may be asked to wait in your car if safe seating is not available.
  • Patients are asked to complete all medical forms using their own devices to avoid using the office tablets.

ONS TELEHEALTH appointments are available for all patients.  Call 203-869-1145 during regular business hours to schedule.

ONS Medical 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.

Physician Hours

Monday – Friday, 8:00 am – 5:00 pm

Urgent Ortho Care

Monday – Friday, 8:00 am – 5:00 pm

Physical Therapy Hours*
Monday – Friday, 7:00 am- 5:00 pm

Stamford MRI Center
Monday – Friday, 8:00 am – 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

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