ONS Adds Two Top Surgeons To The Growing Practice

Orthopaedic and Neurosurgery Specialists (ONS) has announced the addition of Heeren Makanji, MD, an orthopedic spine surgeon, and Kevin J. Choo, MD, an adult reconstruction and joint replacement surgeon, to the Greenwich-based practice.

Heeren Makanji, MD
Heeren Makanji, MD Photo Credit: ONS
Kevin J. Choo, MD
Kevin J. Choo, MD Photo Credit: ONS

Dr. Choo will see patients at the ONS offices in Greenwich and Stamford, CT. He specializes in primary hip and knee replacement for the treatment of degenerative osteoarthritis, inflammatory arthritis, avascular necrosis, hip dysplasia, and post-traumatic arthrosis. 

Dr. Makanji will treat patients with spine disorders at the ONS offices in Greenwich, CT and Harrison, NY. His expertise includes complex cervical and lumbar reconstruction and minimally invasive and robotic navigation-assisted spine surgery. He is experienced in treating degenerative conditions as well as tumors, trauma and infections.

“Dr. Choo and Dr. Makanji were hand-picked for their elite level of training and demonstrated commitment to delivering the highest standard of care to patients,” said Seth Miller, MD, president of ONS. “Their contributions to ONS will further our mission to provide top tier musculoskeletal treatment with compassion and convenience to our growing community in Fairfield and Westchester Counties.”

Dr. Choo earned his medical degree from the University of Chicago and completed his internship and residency at UCSF (University of California, San Francisco). He was fellowship-trained at Rothman Institute, Thomas Jefferson University in Philadelphia, PA, in direct anterior hip replacement, use of computer- and robotic-assisted technology, and partial knee replacement. Dr. Choo has presented and published on such topics as the biology of bone healing, the reduction of opioid use after orthopedic surgery, periprosthetic joint infection management, and partial joint replacement. Dr. Choo was named an Emerging Leader by the American Orthopaedic Association (AOA) and is a reviewer for the Journal of the American Association of Orthopaedic Surgeons (JAAOS).

Dr. Makanji earned his medical degree Harvard Medical School and completed his residency through the Harvard Combined Orthopaedic Residency Program at Massachusetts General Hospital/Brigham & Young Women’s Hospital/Beth Israel Deaconess Medical Center. Dr. Makanji was fellowship-trained in orthopaedic spine surgery at Rothman Institute, where he also served as a clinical instructor in orthopaedic surgery.

ONS has been serving patients throughout Fairfield and Westchester Counties for more than 20 years. The 26 ONS physicians provide expertise in the full spectrum of musculoskeletal conditions and injuries, sports medicine, minimally invasive orthopedic, spine and brain surgery, joint replacement and trauma. ONS is in-network with all major insurances and has offices and advanced physical therapy centers in Greenwich and Stamford, CT and Harrison, NY. MRI services are offered at the Greenwich and Stamford locations. ONS offers same day appointments and after-hours, walk-in urgent orthopedic care for sudden injury. For more information, visit or call (203) 869-1145.

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