{"id":23123,"date":"2026-01-21T11:00:00","date_gmt":"2026-01-21T16:00:00","guid":{"rendered":"https:\/\/www.ices.on.ca\/?post_type=journal_article&#038;p=23123"},"modified":"2026-01-21T12:58:22","modified_gmt":"2026-01-21T17:58:22","slug":"prior-concussions-and-risk-of-disability-for-patients-after-a-motor-vehicle-crash","status":"publish","type":"journal_article","link":"https:\/\/www.ices.on.ca\/fr\/publications\/journal-articles\/prior-concussions-and-risk-of-disability-for-patients-after-a-motor-vehicle-crash\/","title":{"rendered":"Prior concussions and risk of disability for patients after a motor vehicle crash"},"content":{"rendered":"<p><strong>Importance<\/strong> \u2014 Recovery after a motor vehicle crash can be slow, frustrating, and incomplete with lingering neurocognitive complications.<\/p>\n<p><strong>Objective<\/strong> \u2014 To examine whether a prior concussion for patients might be associated with a further increased risk of long-term disability after a motor vehicle crash.<\/p>\n<p><strong>Design, setting, and participants<\/strong> \u2014 This cohort study included adults surviving a motor vehicle crash treated in Ontario, Canada, from April 2003 to March 2023.<\/p>\n<p><strong>Exposure<\/strong> \u2014 Motor vehicle crash.<\/p>\n<p><strong>Main outcome<\/strong> \u2014 Long-term disability defined by official social service records, comparing those with a history of a prior concussion (cases) and those with no history of a prior concussion (controls).<\/p>\n<p><strong>Results<\/strong> \u2014 A total of 907\u202f984 patients injured in a motor vehicle crash were included (mean [SD] age, 37 [14] years; 472\u202f435 male [52.0%]); 19\u202f851 patients had a prior concussion and 888\u202f133 had no prior concussion. A total of 54\u202f678 patients were subsequently diagnosed with long-term disability over 9\u202f543\u202f505 patient-years of follow-up (mean [SD], 10.5 [5.8] years), equal to an absolute risk of 1 in 17 per decade (5.7 per 1000 patient-years). Patients with a prior concussion had a 15% higher adjusted risk of long-term disability (95% CI, 9%-21%; P\u2009&lt;\u2009.001) compared with those with no prior concussion. The increased risk of long-term disability was independent of other measured risk factors, applied to diverse patient groups, and included those involved as passengers or pedestrians. The increased risk extended across a spectrum of crash severity, was accentuated for single-vehicle events, replicated in analyses with artificial intelligence models adjusting for confounding, and remained distinct from the risks of death, readmission, or short-term health care costs.<\/p>\n<p><strong>Conclusions<\/strong> \u2014 This population-based cohort study suggests a significant increased risk of long-term disability after a motor vehicle crash, particular among patients with a prior concussion. More efforts at concussion prevention and traffic safety counseling may be justified for patients.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Importance \u2014 Recovery after a motor vehicle crash can be slow, frustrating, and incomplete with lingering neurocognitive complications. Objective \u2014 To examine whether a prior concussion for patients might be associated with a further increased risk of long-term disability after a motor vehicle crash. Design, setting, and participants \u2014 This cohort study included adults surviving [&hellip;]<\/p>\n","protected":false},"template":"","migration-helper-automated":[],"migration-manual":[],"topic":[55,35],"migration-helper-qa-sample-set":[],"class_list":["post-23123","journal_article","type-journal_article","status-publish","hentry","topic-injuries-and-accidents","topic-public-health"],"acf":{"citation":"Redelmeier DA, Bhatt V, Drover SSM. <em>JAMA Netw Open<\/em>. 2026; 9(1): e2554831.","source_url":"https:\/\/doi.org\/10.1001\/jamanetworkopen.2025.54831","ices_scientist":[1337],"site":[6733],"research_program":[6745],"news_release":"","journal_article":"","atlas":"","research_report":"","infographic":"","video":"","downloads":null,"links":null,"sitecore_item_id":"","sitecore_item_name":"","sitecore_field_values":"","previous_url":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ICES | Prior concussions and risk of disability for patients after a motor vehicle crash<\/title>\n<meta name=\"description\" content=\"Importance \u2014 Recovery after a motor vehicle crash can be slow, frustrating, and incomplete with lingering neurocognitive complications. 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