Usually, cervical spine fractures are not considered as osteoporotic fractures. However, recent studies show that odontoid fractures are the most common fractures of the cervical spine in elderly and may occur in a context of low trauma energy. Thus, the goal of this observationnal study is : * to describe the different type of odontoid fracture and to characterize bone status in elderly patient (\>65 y) who underwent odontoid fracture in a context of low trauma energy. * To describe short and long term outcomes
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bone status at the time of odontoid fracture: bone mineral density, prevalent osteoporotic fracture, vitamin D status
Timeframe: from date of inclusion until to 3 weeks after the event. Inclusion will be proposed within 2 weeks after the fracture