Hangman's fracture

[1] The injury mainly occurs from falls, usually in elderly adults, and motor accidents mainly due to impacts of high force causing extension of the neck and great axial load onto the C2 vertebra.

[5] Apart from hangings, the mechanism of injury—a sudden forceful hyperextension centered just under the chin—occurs mainly with deceleration injuries in which the victim's face or chin strike an unyielding object with the neck in extension.

The most common scenario is a frontal motor vehicle accident with an unrestrained passenger or driver, with the person striking the dashboard or windshield with their face or chin.

A person involved in a car crash, especially with no seat belt, can slam their chin against the steering wheel, dashboard, or windshield, causing the hyperextension to occur.

[6][7] Sasso also observed that people who underwent surgical treatment will not be affected by pin site infections, brain abscesses, facet joint stiffness, loss of spinal alignment, and skin breakdown.

[6] Another study concerns the surgical treatment of the ring of axis conducted by Barsa and coauthors (2006) based on 30 cases within 41 patients treated by using anterior cervical fixation and fusion and 11 cases treated by a posterior CT.[8] As a result, Barsa and coauthors showed that the result of fracture fusion reduced after one year but only one patient died of other disease during the follow-up.

[8] Hakalo and Wronski (2008) showed the benefits of operative treatment such as using transoral C2-C3 discectomy with plate-cage stabilization or posterior direct pars screw repair for the reducing and healing process.

X-ray of the cervical spine with a Hangman's fracture. Left without, right with annotation. It can be seen clearly that C2 (red outline) is moved forward with respect to C3 (blue outline).
A demonstration of a common mechanism of a hangman's fracture in a car accident
The pie chart shows the incidence of C2 fractures according to age groups. For the <17 age group, there were 203 incidents. For ages 18-44 there were 1843. For 45-64 there were 2147. For 65-84 there were 4890 and for 85+ there were 3440 incidents. A total of 12,532 discharges in America were reported in 2010.
The graph shows the trend of hospital charges and number of discharges over the span of 12 years in the U.S.A. In 1998, hospital costs were $24,423 with 4,991 discharged. In 2010 hospital charges increased to 59,939 with 12,532 discharged.