After-Hours Urgent Ortho Care is now available in Wilton, Monday to Friday from 4:00 pm to 7:00 pm and Saturdays from 12:00 to 4:00 pm. Walk-ins welcome.

Kevin J. Choo, MD

Located In

Greenwich, Harrison, Stamford


Kevin J. Choo, MD, is a board-certified orthopedic surgeon who specializes in primary hip and knee replacement for the treatment of degenerative osteoarthritis, inflammatory arthritis, avascular necrosis, hip dysplasia, and post-traumatic arthrosis. He is fellowship-trained in direct anterior hip replacement, the use of computer- and robotic-assisted technology, and partial knee replacement. Dr. Choo specializes in opioid-sparing protocols, rapid recovery surgical techniques, and outpatient total hip and total knee replacements.

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 received fellowship training in Adult Reconstruction and Joint Replacement at the Rothman Institute in Philadelphia, PA. 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). He is a reviewer for the Journal of the American Association of Orthopaedic Surgeons (JAAOS) and the Journal of Orthopaedic Trauma (JOT). He is also a 2023 Castle Connolly Top Doctor.

  • Commercial Plans (Including APCN Plus, We do not accept regular APCN)
  • Managed Medicare
Anthem Blue Cross Blue Shield of CT
  • Commercial and Exchange
  • Managed Medicare
Blue Cross Blue Shield (Plans Outside CT)
  • Cards with the “PPO” inside the suitcase logo
CarePartners of Connecticut
  • Managed Medicare (HMO/PPO)
  • Commercial, MetroNY, and LocalPlus
  • Cigna+Oscar, Cigna+MVP (CT Locations Only)
  • Commercial and Exchange (Except “Value” Network)
  • Managed Medicare
Connecticut Medicaid
Connecticut State Workers’ Compensation
  • Emblem Commercial and Exchange (Except for Millennium and Enhanced Care Prime Networks)
  • Managed Medicare (VIP Prime, Bold, Reserve)
Harvard Pilgrim
  • Through United Shared Services – ONS Harrison location only.
Medicare (Including Railroad Medicare)
  • Liberty and Freedom Plans
UHC/NYSHIP/NY Government Empire Plan
United Healthcare
  • All Commercial Plans (Except Indemnity and Compass)
  • Managed Medicare

Orthopaedic & Neurosurgery Specialists (ONS) accepts most major insurance plans. Please see the list of accepted insurance plans above and confirm that ONS participates with your plan prior to scheduling an appointment. Certain insurance plans are limited to specific regions and physicians. If you have additional questions, please call our offices at (203) 869-1145 ext. 279 and our team will be happy to provide additional information.


Fellowship in Adult Reconstruction and Joint Replacement: Rothman Institute, Thomas Jefferson University, Philadelphia, PA

Medical School

University of Chicago, Pritzker School of Medicine, Chicago, IL


Residency in Orthopedic Surgery: University of California San Francisco (UCSF), San Francisco, CA


Stanford University, Department of Biological Sciences, Palo Alto, CA

  • American Board of Orthopaedic Surgery: Orthopaedic Surgery Board Certification

  • Castle Connolly Top Doctor, 2022-Present
  • American Orthopaedic Association (AOA), C.McCollister Evarts Leadership, UCSF
  • American Orthopaedic Association (AOA), Emerging Leader, UCSF

  • Castle Connolly Top Doctor, 2022-Present
  • Health Volunteers Overseas (HVO) Traveling Fellowship, UCSF (Managua, Nicaragua)
  • Scholarship and Discovery Research Grant, University of Chicago
  • Howard Hughes Medical Institute (HHMI) Research Grant, Stanford University

Published Research
  • Yazdi, H, Choo KJ, Restrepo C, Hammad M, Sherman M, Parvizi J. Short Term Results of Triathlon Cementless versus Cemented Primary Total Knee Arthroplasty. The Knee. 2020. (accepted, pending publication)
  • Choo KJ, Austin M, Parvizi J. Irrigation and debridement, modular exchange and implant retention for acute periprosthetic infection after total knee arthroplasty. Journal of Bone and Joint Surgery (JBJS) Essent Surg Tech. 2019.
  • Choo KJ, Grace TR, Khanna K, Barry J, Hansen EN. A Goal-directed Quality Improvement Initiative to Reduce Opioid Prescriptions After Orthopaedic Procedures. JAAOS Global Research & Reviews. 2019 Sept 17;3(9)
  • Grace TR, Choo KJ, Patterson J, Khanna K, Feeley, BT, Zhang AL. A Review of Inpatient Opioid Consumption and Discharge Prescription Patterns after Orthopaedic Procedures. Journal of the American Academy of Orthopaedic Surgeons. 2019.
  • Grace TR, Khanna K, Choo KJ, Croci R, Feeley BT, Ma CB, Zhang AL. The Influence of Preoperative Opioid Use on Inpatient Opioid Requirements and Discharge Medication Prescriptions After Primary Shoulder Arthroplasty. J Shoulder Elbow Surg. 2018; Apr 24. pii S1058-2746(18)30173-
  • Wong K, Burns R, Mohan R, Yi PH, Choo KJ. Variability in Conflict of Interest Disclosures by Physicians Presenting Trauma Research. World J Orthop. 2017; Apr18;8(4):329-335
  • Choo KJ, Yi PH, Burns R, Mohan R, Wong K. Variable Reporting by Authors Presenting Arthroplasty Research at Multiple Annual Conferences. J Arthroplasty. 2017; 32:315-219
  • Wang Z, Tran M, Bhatia N, Hsing A, Chen C, LaRussa M, Fattakhov E, Rshidi V, Hang KY, Choo KJ, Nie X, Mathy J, Longaker MT, Dauskardt R, Helms J, Yang GP. DEL1 Knockout Mice Developed More Severe Osteoarthritis Associated with Increased Susceptibility of Chondrocytes to Apoptosis. PLoS One. 2016 Aug 9;11(8)
  • Horst PK, Choo K, Bharucha N, Vail TP. Graduates of Orthopaedic Residency Training are Increasingly Subspecialized: A Review of the American Board of Orthopaedic Surgery Part II Database. J Bone Joint Surg Am. 2015 May 20;97(10): 869-7
  • Morshed S, Choo KJ, Kandemir U, Kaiser SP. Internal Fixation of Posterior Pelvic Ring Injuries Using Iliosacral Screws in the Dysmorphic Upper Sacrum. JBJS Essent Surg Tech. 2015 Feb 11; 5 (1): e3
  • Choo KJ, Arora VM, Barach P, Johnson JK, Farnan JM. How Do Supervising Physicians Decide to Entrust Residents with Unsupervised Tasks? A Qualitative Analysis. J Hosp Med. 2014 Mar;9(3):169-75
  • Choo KJ, Morshed S. Postoperative Complications After Repair of Tibial Plateau Fractures. J Knee Surg. 2014 Feb;27(1):11-9
  • Guzman R, De Los Angeles A, Choo K, Gaeta X, Cote J, Cheshier S, Steinberg GK. Intra-carotid Delivery of CD49d FACS Sorted Neural Stem Cells Enhances Angiogenesis and Improves Functional Outcome After Stroke. Stroke 2008 (39);527-72
  • Choo KJ, Malkani K, Cooper AM, Yazdi H, Parvizi J. Dual-Mobility Bearings and Constrained Liners in Revision Total Hip Arthroscopy: A Comparison of Outcomes. American Academy of Orthopaedic Surgeons (AAOS) National Meeting (2020)
  • Grace T, Khanna K, Choo K, Zhang A. Does Tailoring Discharge Opioid Regimens to Inpatient Use After Orthopaedic Procedures Affect Refill Rates. Western Orthopaedic Association Annual Meeting, Snowmass, CO. 2018 August 2.
  • Choo KJ, Sing D, Hansen E. Psychological Distress after Diagnosis and Treatment for Prosthetic Joint Infection. UCSF Abbott Society Scientific Program (2018)
  • Choo KJ. Conflict of Interest in Orthopaedic Surgery. UCSF Dept. Orthopaedic Surgery Grand Rounds (2017)
  • Choo KJ, Morshed S, Wustrack RL, O’Donnell RJ. Femoral Pathologic Fracture in Morbidly Obese Patient Managed with External Fixation and Compressive Osseointegration. Advances in Orthopaedic Osseointegration Conference (2015)
  • Choo KJ, Arora VM, Barach P, Julie JK, Farnan JM. When Do Supervising Physicians Decide to Entrust Residents With Unsupervised Tasks? A Qualitative Study. Society of General Internal Medicine- National Conference (2012)
  • Choo KJ, Farnan JM, Barach P, Arora VM. Factors that Determine Entrustment, Supervision, and Autonomy of Housestaff During Inpatient Medicine Rotations: A Qualitative Study. Society of General Internal Medicine- Midwest Conference (2011)
  • Choo KJ, Wang Z, Longaker MT, Yang GP. Histomorphometric Analysis of Tibial Bone Fracture in Del-1 Knockout Mice. American College of Surgeons Clinical Congress (2009)
Poster Presentations
  • Choo, KJ, Rajaravivarma, R, Hozack W. Effect of Femoral Head Material on Head-to-Trunnion Impaction Motion and Taper Stability. Orthopaedic Research Society (ORS) Annual Meeting (2020)
  • Choo KJ, Farnan JM, Barach P, Arora VM. Factors that Determine Entrustment, Supervision, and Autonomy of Housestaff During Inpatient Medicine Rotations: A Qualitative Study. Midwestern Hospitalist Medicine Conference (2011)
  • Choo KJ, Taxy J, Blair EA. Salivary Gland Mucoepidermoid Carcinoma: An Institutional Review. American College of Surgeons Clinical Congress (2010).
  • Choo KJ, Lonner JH. (2019) Treating Patellofemoral Osteoarthritis with Unicompartmental and Bicompartmental Knee Arthroplasty. Unicompartmental Knee Arthroplasty: Indications, Surgical Techniques and Complications. New York, NY: Springer Publishing. [textbook chapter]
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