Specialty: Total Joint Surgery



Specialty: Total Joint Surgery



Total Joint Surgery



> Harvard Medical School, Boston, MA - Fellowship, Adult Reconstructive Surgery
> Northwestern University, Chicago, IL - Residency, Orthopaedic Surgery
> Northwestern Unviersity, Feinberg School of Medicine, Chicago, IL - Doctor of Medicine
> Boston University, Boston, MA - Bachelor of Arts

Certifications & Affiliations

American Board of Orthopaedic Surgeons

Presentations & Publications

Dr. Dion sits down with Chris Ryan of WKXL to talk about total hip and knee replacement.

Outcomes in Primary Total Knee Arthroplasty. Dion NT. Massachusetts General Hospital,
Arthroplasty Conference; September 26, 2014.
Thrombotic Events in Patients Undergoing Total Joint Arthroplasty at Northwestern Memorial
Hospital from 2002 – 2013. Dion NT, Kinder J, Kwasny M, Stulberg D, Puri L. Northwestern
University, Department of Orthopaedic Surgery; Thesis Day. May 30, 2014.
Computer-Assisted Surgery and Customized Instrumentation in TKA. Dion NT. Northwestern
Memorial Hospital; Chairman’s Conference. May 6, 2014.
Hip and Pelvis Pathology, Treatment, and Rehabilitation. Dion NT. Northwestern University,
Department of Physical Therapy and Human Movement Sciences Lecture. February 7, 2014.
Osteoporotic and Periprosthetic Fractures. Dion, NT. Northwestern University, Department of
Orthopaedic Surgery; Fracture Conference. December 3, 2013.
Infections in Total Joint Arthroplasty. Dion NT. Northwestern Memorial Hospital; Chairman’s
Conference. May 7, 2013.
Biomechanical Comparison of Locked versus Non-Locked Plating for Fixation of Open Book
Pelvic Injuries. Thangamani VB, Stewart BA, Zhao H, Dion NT, Rotstein JL, Zhang L, Merk
BR. Presented at Mid-America Orthopaedic Association Annual Meeting. Austin, TX. April,
Durability of Highly Crosslinked Polyethylene in Total Hip and Total Knee Arthroplasty.
Dion NT, Bragdon C, Muratoglu O, Freiberg AA. Pending Publication in Orthopedic Clinics
of North America, April, 2015.
Thrombotic Events in Patients with a History of Thromboembolic Disease Undergoing Total
Joint Arthroplasty. Dion NT, Kinder J, Kwasny M, Stulberg SD, Puri L. Submitted to Journal
of Arthroplasty.
Do Metal Ion Levels Normalize Following Revision Surgery for ‘Pseudotumours’ in Patients
with Corrosion of Dual Taper Modular THA? Kwon YM, Leone W, Dion NT, Tsai TY, Li G,
Rubash HE, Freiberg AA. Manuscript Pending Submission.
A Comparison of MRI and Ultrasound for the Imaging of Soft Tissue Reactions to Metal-on-
Metal Total Hip Arthroplasty. Dion NT, Kwon YM. IRB Approved. Data Collection in
Primary Total Hip Arthroplasty: Principles, Planning, and Decision Making. Dion NT, Kwon
YM. Pending publication in Master Techniques in Orthopaedic Surgery: The Hip, 3rd edition.


  • "Dr. Dion was caring, considerate and very pleasant."

    Dr. Dion was caring, considerate, and very pleasant.

    - Valerie | November, 2016
  • Call from Dr. Dion was prompt.

    Call from Dr. Dion post-surgery was prompt.

    - Dan |
  • Dr. Dion was wonderful

    Dr. Dion was wonderful.

    - J.J. | Concord, NH
  • "Dr. Dion as very good explaining..."

    Dr. Dion was very good explaining what was going to happen and describing the knee that I was getting. Could't believe he called me on Sunday to see how I was doing!!

    - J. | August 2017

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To our Patients, Families and Communities,

Your health, welfare & safety are paramount when you come for an appointment at any of our facilities. We are closely monitoring the guidance of the World Health Organization and the Centers for Disease Control & Prevention regarding the spread of the virus. Our focus is to ensure we meet our patient’s needs while doing our part to keep you, our associates, and our communities safe. Effective immediately, the Acute Injury Clinic (AIC), will remain open Monday-Friday from 9 a.m. - 4 p.m. The AIC will NOT open on Saturdays.

At this time, the impact to our communities has been minimal and our staff is focused on providing the orthopaedic care our patients expect and deserve. If you have an appointment with us, we respectfully ask that you let us know if you have a fever, cough, and/or shortness of breath in advance of your appointment. Also, if you have recently traveled to or been in close contact with anyone who has traveled outside of New Hampshire, especially to New York State, we ask that you avoid visiting our practice for a period of 14 healthy days.

Thank you for your continued trust in COPA. We appreciate your cooperation as we work to support the health of our patients & employees.


Ron Chorzewski