• Michael Brendan Cloney, Thomas J Buell, David A Paul, T Jayde Nail, Hanish Polavarapu, Mohamed-Ali Jawad-Makki, Samuel Adida, and David O Okonkwo.
• Department of Neurosurgery, Michigan Medicine, Ann Arbor, MI, United States. Electronic address: michael.cloney@yahoo.com.
• World Neurosurg. 2024 Dec 16: 123580123580.

BackgroundSimultaneous fractures of C1 and C2 are increasingly common, but contemporary series are limited in their evaluation.MethodsAll patients with traumatic fractures of both C1 and C2 admitted to an academic trauma center from 2012 to 2022 were retrospectively analyzed. Multivariable regression was used to identify characteristics relevant to management and outcomes.Results103 patients were identified, most of whom (52.4%) were age ≥80 years, suffered ground-level falls (80.6%), and had minor associated injuries (median Injury Severity Score 1), but had a 28.2% 1-year mortality rate. Landells Type 1 fractures were the most common C1 fracture (50.5%), and dens fractures were the most common C2 fracture (74.8%). Most patients did not undergo MRI, but ligamentous injury was seen in 54.8% of those who did. Fourteen patients (13.6%) had surgery upfront, and 7 (6.8%) had surgery after a trial of nonoperative management. Selection for upfront surgery was associated with neurologic deficits (p=0.010) and age (p=0.026). Dens fracture patients tended to have C2 as their lower instrumented vertebra (p=0.0902), and hangman's fracture patients tended to have C3 as theirs (p=0.0714). Upfront surgery decreased the odds of bony nonunion (p=0.0281). 91.7% of patients with bony nonunion with flexion-extension films had fibrous nonunion.ConclusionSimultaneous atlantoaxial fractures commonly occur in elderly patients after ground level falls with minor associated injuries. Surgical selection is driven by neurologic deficits and age, and C2 fracture type may influence procedure choice. Surgery decreases the odds of bony nonunion, and fibrous nonunion is common in its absence.Copyright © 2024. Published by Elsevier Inc.

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