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Henry Ahn

MD, FRCSC, PhD

Investigator

Email: Henry.Ahn@unityhealth.to
Tel: 416-864-6005

Research Programs

Biography

Dr. Henry Ahn is an orthopaedic surgeon and Associate Scientist in the Li Ka Shing Knowledge Institute at St. Michael’s Hospital.  He has a PhD in Clinical Epidemiology from the Institute of Health Policy, Management and Evaluation (IHPME) at the University of Toronto. His clinical practice is focused on the management of polytrauma patients with significant orthopaedic injuries, spinal cord injuries, along with complex adult spinal disorders. Dr. Ahn is a member of the University of Toronto Spine Program and is a Principal Investigator with the Rick Hansen Registry.  He has a research interest in the management of spinal cord injury and the epidemiology of spinal cord injury incorporating large databases, prospective cohort studies, along with randomized control trials.

Recent Publications

  1. Natoli, RM, Marchand, LS, Bzovsky, S, Hagen, JE, Gage, MJ, Stennett, CA et al.. Infection and Nonunion Rates in Open Fractures: Description of 6,042 Fractures from the FLOW and PREP-IT Trials. J Bone Joint Surg Am. 2025;107 (22):2541-2553. doi: 10.2106/JBJS.24.01055. PubMed PMID:41315040 PubMed Central PMC12614385.
  2. Bzovsky, S, O'Hara, NN, Slobogean, GP, Sprague, S, Axelrod, DE, Hoit, G et al.. Revisiting the FAITH Trial: A Secondary Analysis Yielding Novel Insights with the Win Ratio. JB JS Open Access. 2025;10 (4):. doi: 10.2106/JBJS.OA.25.00230. PubMed PMID:41281368 PubMed Central PMC12637341.
  3. Khan, JS, Mulazzani, F, Devereaux, PJ, Bhandari, M, Guerra-Farfan, E, Patel, A et al.. Pain as a Driver of Myocardial Injury in Hip Fracture Patients: A Hip Fracture Accelerated Surgical Treatment and Care Track (HIP ATTACK) Trial Secondary Analysis. Anesthesiology. 2025; :. doi: 10.1097/ALN.0000000000005818. PubMed PMID:41147656 .
  4. Cardahi, F, Georgiopoulos, M, Siddique, A, Urquhart, J, McIntosh, G, Fourney, D et al.. Surgical practice variation and outcomes regarding single-level posterior approach for degenerative lumbar spondylolisthesis: a Canadian spine outcomes research network (CSORN) study. Spine J. 2025; :. doi: 10.1016/j.spinee.2025.10.027. PubMed PMID:41109512 .
  5. Kato, H, Nishimura, Y, Ginsberg, HJ, Wilson, JR, Witiw, CD, Ahn, H et al.. Radiological Improvements and Clinical Outcomes of Occipitocervical Fusion for Traumatic Cranocervical Junction Instability. World Neurosurg. 2025;202 :124393. doi: 10.1016/j.wneu.2025.124393. PubMed PMID:40840781 .
  6. Righolt, CH, Borges, FK, Sniderman, J, Turgeon, TR, Devereaux, PJ, Bhandari, M et al.. Cemented Fixation in Arthroplasty for Hip Fractures Does Not Increase Cardiopulmonary Complications: A Secondary Analysis of the HIP ATTACK Trial. Clin Orthop Relat Res. 2025; :. doi: 10.1097/CORR.0000000000003645. PubMed PMID:40828989 .
  7. Cinats, DJ, Viskontas, D, Stone, T, Perey, B, Moola, F, Boyer, D et al.. Infrapatellar Versus Suprapatellar Nailing for Fractures of the Tibia (INSURT Study): A Multicentered Randomized Controlled Trial. J Orthop Trauma. 2025;39 (10):537-541. doi: 10.1097/BOT.0000000000003029. PubMed PMID:40504644 .
  8. Megaloikonomos, PD, Nowak, L, Shehata, M, Sprague, S, Bzovsky, S, Epure, LM et al.. Does Stem Design Affect the Incidence of Periprosthetic Femoral Fractures in Arthroplasty for Femoral Neck Fractures? A Secondary Analysis of the HEALTH Trial. J Arthroplasty. 2025;40 (8S1):S322-S327.e3. doi: 10.1016/j.arth.2025.02.036. PubMed PMID:39978649 .
  9. Lefaivre, KA, Slobogean, G, O'Hara, NN, O'Brien, PJ, Canadian Orthopaedic Trauma Society (COTS) Investigators. Far Cortical Locking Versus Standard Constructs for Locked Plate Fixation in the Treatment of Acute, Displaced Fractures of the Distal Femur: A Multicenter Randomized Trial. J Bone Joint Surg Am. 2024;106 (19):1739-1749. doi: 10.2106/JBJS.23.01390. PubMed PMID:39853223 .
  10. Dionne, A, Al-Zakri, M, Labelle, H, Joncas, J, Parent, S, Mac-Thiong, JM et al.. Canadian Spine Society: 24th Annual Scientific Conference, Wednesday, February 28 - Saturday, March 2, Fairmont Chateau Whistler, Whistler, B.C., Canada. Can J Surg. 2024;67 (6suppl1):S17-S76. doi: 10.1503/cjs.011424. PubMed PMID:39537311 PubMed Central PMC11573431.
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Affiliations & Other Activities

  • Assistant Professor, Division of Orthopaedic Surgery, University of Toronto
  • Assistant Professor, University of Toronto Spine Program, University of Toronto