Descriptive epidemiology of traumatic spinal injury in Japan

Spine injury epidemiology in Japan has not been studied since the 1990s when its incidence was 39.4-40.2 per million and the major cause of injury was motor vehicle crashes. We elucidate the current epidemiological state of spinal injury and spinal injury patients in Japan for the clinicians and public health prevention programs.

Spine injury patients were retrospectively selected from the Japan Trauma Data Bank (JTDB) from 2004 to 2013 for all ages and all spinal injuries. The Abbreviated Injury Scale codes (AIS98) were translated into injuries. The dataset was contributed by 241 hospitals nationwide. The data was analysed for the causes of spinal injury, injury severity, age, gender differences, injury types, survival, anatomic location, circumstances of injury and medical history.

A total of 25,792 (M, 70.1%, F, 29.9%, mean age: 53.4 years) spinal injury patients were recorded in the JTDB from 2004 to 2013, when multiple injuries were included the number of cases swelled to 33,892 (M, 70.4%, F, 29.6%). The number of patients with spinal injuries as a percentage of all traumatic patients in the JTDB was observed to increase from 2004 (15.4%) to 2013 (17.6%). The aetiology of the injuries was mostly falls (52.4%) and motor vehicle crashes (39.8%). Most injuries occurred at the cervical spine level (49.7%). Medical histories of cardiovascular diseases were found, due mostly to hypertension (19.6%). In total, most of the injuries were associated with fractures (64.8%) and others (30.7%) involved the spinal cord. Suicides (12.0%) and industrial accidents (9.0%) caused spine injury were uniquely prevalent in the population.

The number of spine injuries has increased in the JTDB between 2004 and 2013. Motor vehicle crashes have been replaced by falls due to various causes as the leading cause of spine injury. Suicides and industrial accidents are becoming a burden. More studies are needed to verify the actual incidence.