Your Journey to Recovery Starts Here
Welcome to Oak Tree Orthopedics
Oak Tree Orthopedics is a private practice based in the Inland Empire & Orange County, California.
Centered around the patient journey, Oak Tree Orthopedics strives to provide patients and their families with unsurpassed personalized care, delivered by Harvard-trained orthopedic surgeon, Dr. Nasser Heyrani. His motivation to start a private practice with individualized care for patients came from his years at major hospital groups across the East and West Coasts. With the evolution of the healthcare industry — a shift from personal to business-centric.
Oak Tree Orthopedics’ 1:1 approach works closely with the patient, their medical history, lifestyle and circumstances, to offer the best specialized treatment, towards a healthy and speedy recovery. Whether taking care of professional athletes on or off the field, or creating a long-term plan for geriatric patients with chronic arthritic pain, Oak Tree Orthopedics aims to become a trusted practice for families across Southern California.
Meet Our Doctors
Dr. Heyrani
Dr. Heyrani is a Board Certified Diplomate of the American Board of Orthopedic Surgery and a Harvard-trained orthopedic surgeon. He received his undergraduate and medical degrees from UCLA, completed his orthopedic residency at UC Davis, and pursued a subspecialty fellowship in foot & ankle reconstructive surgery at Harvard-Massachusetts General Hospital under Dr. Christopher DiGiovanni. Dr. Heyrani has published several academic studies, spoken nationally about stem cell regenerative therapies, and served as a team physician for the New England Revolution during his fellowship. He consults for Lincoln City Football Club in the English Football League.
Dr. Matthewson
Dr. Graeme Matthewson, M.D., is a fellowship-trained orthopedic surgeon specializing in sports medicine with a focus on arthroscopy and shoulder reconstruction. Personal sports injuries served as inspiration for him to begin his medical career, and he received top honors from the University of Calgary Medical School. After an orthopedic residency at the University of Manitoba, he pursued further training in sports medicine at the Southern California Orthopedic Institute and shoulder and elbow arthroplasty in San Francisco. Dr. Matthewson practices patient-centered care, emphasizing minimally invasive techniques to improve recovery outcomes. Outside of work, he enjoys outdoor activities with his family in Southern California.
Foot and Ankle
Shoulder
Knee
Wrist & Hand
Elbow
Platelet Rich Plasma (PRP) & Orthobiologics
Affiliations
Patient Testimonials
Dr. Heyrani is on a different level, he is great at what he does and I can go on about what a great surgeon and a doctor he is, how unlike some doctors he looks for the cause and not the symptoms, how he still does his research and on and on.. Yet, what I love about him is that he is a great human being. He doesn’t just hear you but listens deeply. Great doctor and a great human!
I highly recommend Dr. Heyrani and his staff. Dr. Heyrani operated on me for a fractured ankle and had a very successful outcome. He definitely cares for his patients! I had a situation with my insurance and the doctor went out of his way to ensure the surgery was still possible prior to my insurance expiring. I have always left his office well informed and with a plan until our next scheduled visit.
I broke my tibia at the knee, requiring an extensive repair and recovery. Dr. Heyrani and his staff were extremely attentive and personable. Dr. Heyrani is a very skilled surgeon, my pain has been minimal and the incision is healing up nicely. I am so lucky to have had him throughout my recovery. I highly recommend him!
Dr. Heyrani is an incredible physician. He has a great bed-side manner, and takes his time answering all our questions. We had no issues or complications scheduling an appointment, being seen, and I am already on the fast road to recovery. Extremely grateful for this practice.
Dr. Heyrani is incredible. Not only has he taken great care of my son’s knee, but also he has always taken the time to explain every aspect of his injury in detail to me at every appointment. It is rare to find a doctor that combines such personal touches and truly shows care for his patients. His bedside manner is unparalleled!
From our first appointment I felt at ease and finally felt like my doctor was in my corner and was willing to listen to my personal concerns, recovery time and what the surgery would mean for my lifestyle — rare for a surgeon to take all of these things into consideration and truly hear me out. It really felt like personalized care. I can’t be more grateful.
Dr. Nasser Heyrani is a truly awesome doctor! I saw him last year for an issue I was having and again a couple months ago for my 6-year-old son. On both occasions he was so caring, professional, and knowledgeable. The best thing about him was that he took his time with us with determination to resolve our ailments. We are so grateful!
Based on online research…, I decided to see Dr Heyrani for my acute pain and inflammation on my right foot. You can see how genuine and passionate Dr Heyrani towards his profession which play a pivotal role in his treatment towards his patient. Would like to thank Dr Heyrani for his great treatment and speedy recovery.
Absolutely love this clinic. Dr. Heyrani is the best! I was in so much shoulder pain and chose to get surgery Dr. Heyrani and his assistant were able to coordinate with my insurance company to expedite my surgery. Recovery was quick like he had explained. Dr. Heyrani is a wonderful & knowledgeable surgeon. HIGHLY recommend this place!
Dr. Heyrani went above and beyond in taking care of me after my riding accident. Dr Heyrani was extremely knowledgeable and took his time explaining my different options. His beside manner was incredible. It’s rare to find a doctor that combines such personal touches and care for their patients. I am now back in the saddle again!
