C2 Fracture Subtypes, Incidence, and Treatment Allocation Change with Age: A Retrospective Cohort Study of 233 Consecutive Cases

Table 1

Population-at-risk and annual incidence (per 100,000 person-years) of C2 fractures divided into odontoid, Hangman’s, and atypical fractures during the years 2002 to 2014.

Age and gender	Population-at-risk	Annual incidence (per 100,000 person-years) 2002–2014
		Odontoid fractures	Hangman’s fractures	Atypical fractures	Total
Men <70	201,402	1.0	0.4	0.5	1.9
Women <70	201,444	0.5	0.2	0.03	0.8
Men ≥70	28,713	15.8	0.8	1.3	17.9
Women ≥70	41,382	16.0	1.1	0.7	17.8
Total	472,941	3.0	0.4	0.4	3.8