<qa>  What is the most common spinal fracture among the elderly?Fractures of the second cervical vertebra C2 are the most common spinal fracture among the elderly. Non-surgical treatment comprises of cervical collar treatment for 12 weeks, while surgical treatment for elderly could mean posterior fixation C1-C2 without collar treatment or anterior screw osteosynthesis C2 with 6 weeks of collar treatment. A meta-analysis of retrospective studies has recently found an improved survival with surgical treatment. This national registry study is designed to estimate the survival of non-surgical and surgical treatment in a population-based cohort. 