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Nonfatal road collisions affect 20 to 50 million individuals globally each year and often cause whiplash-associated disorders (WADs). WAD grade II (WADII) is the most common type, with neck symptoms and musculoskeletal signs but no clear nerve injury on standard clinical examination. Yet pain in WADII can persist. To identify underlying nerve pathology and to see how it correlates with persistent pain, researchers conducted a longitudinal cohort study in the U.K. of 129 adults with acute WADII (median age, 36 years; 58% female) and 36 unaffected controls. Data collected included neurologic assessment, quantitative sensory testing (QST), and measurements of intraepidermal and dermal nerve fiber density and serum neurofilament (NfL) concentra…