ONS Greenwich

ONS Physicians, Physical Therapy & MRI Center
6 Greenwich Office Park, Greenwich, CT 06831

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.

ONS Urgent Ortho Care Hours
Monday – Friday, 5:00 pm – 8:00 pm
Saturday, 12:00 pm – 4:00 pm

ONS Business and Administration Office
9 Greenwich Office Park, Building # 9, Greenwich, CT 06831

ONS Physicians in Greenwich

ONS Greenwich Office

Paul Apostolides, MD


Jonathan L. Berliner, MD

Hip & Knee Replacement, Revision

Mark H. Camel, MD


Matthew Cantlon, MD

Hand, Wrist & Elbow

Michael R. Clain, MD

Foot & Ankle

James G. Cunningham, MD

Sports Medicine, Shoulder & Knee

Demetris Delos, MD

Sports Medicine, Shoulder & Knee

Frank A. Ennis, MD

Hip & Knee Replacement, Revision

Amory J. Fiore, MD


R. Tim Greene, MD

Sports Medicine, Hip & Knee

Jeffrey M. Heftler, MD

Interventional Physiatry, Rehabilitation

Steven E. Hindman, MD

General Orthopedics, Trauma

Brian F. Kavanagh, MD

Hi & Knee Replacement, Revision

Tamar Kessel, MD

Interventional Physiatry, Rehabilitation, Sports Medicine, EMG

Marc S. Kowalsky, MD

Sports Medicine, Shoulder, Elbow & Knee

Alex Levchenko, DO

Interventional Physiatry, Sports Medicine, EMG

Seth R. Miller, MD

Shoulder Replacement, Comprehensive Shoulder

David P. Nocek, MD

General Orthopedics

Sean C. Peden, MD

Foot & Ankle, Trauma

Paul M. Sethi, MD

Sports Medicine, Shoulder, Elbow, Knee, Shoulder Replacement

Christopher S. Sahler, MD

Interventional Physiatry, Sports Medicine, EMG

Scott L. Simon, MD

Neurosurgery, Scoliosis

Katherine Vadasdi, MD

Sports Medicine, Shoulder, Elbow, Knee, Shoulder Replacement

Mark A. Vitale, MD

Hand, Wrist & Elbow

David H. Wei, MD

Hand, Wrist & Elbow

Mark Yakavonis, MD

Foot & Ankle

Physical Therapists in Greenwich

New Patients

For New Patients, or if you have not visited our offices in more than a year, please arrive 30 minutes prior to your scheduled appointment time to complete your registration.  To save time, the registration form and medical history form can submitted online through the Patient Portal.

Please also bring the following items 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.