The incidence and trauma mechanisms of acetabular fractures: A nationwide study in Finland between 1997 and 2014

Purpose: Information on the incidence of acetabular fractures of the pelvis is limited. Epidemiological data is often based on specific trauma registers, individual trauma centres or on trends of all pelvic fractures grouped together. The primary aim of this study was to determine the incidence and trends of hospital-treated acetabular fractures in the Finnish population from 1997 to 2014. The secondary aim was to assess the trauma mechanisms involved. Methods: The Finnish National Hospital Discharge Register collects inpatient data from all public and private medical institutions in Finland and covers the entire Finnish population of 5.5 million. For this study, we selected all persons 18 years of age or older who were admitted to hospital for the treatment of an acetabular fracture between 1997 and 2014. The main outcome variable was the annual number of patients hospitalised with a main or secondary diagnosis of acetabular fracture of the pelvis. Results: The overall crude incidence of acetabular fractures increased slightly (from 6.4/100 000 persons/year to 8.1/100 000 persons/year) from 1997 to 2014 while the age-standardised incidence rate remained at a similar level (7.1/100 000/persons/year in 1997 and 7.2/100 000/persons/year in 2014). An incidence increase was observed in the elderly population, whereas the incidence of acetabular fractures in the younger population (mostly high energy traumas) remained stable. The most frequent trauma mechanism for acetabular fractures was fall on the same level (47%). Conclusions: The incidence of acetabular fractures increased slightly in Finland between 1997 and 2014. This increase was observed especially in the elderly population and the ageing of the population largely explains the rise. The incidence of acetabular fractures in the younger population decreased. The most common trauma mechanism was falling on the same level. (C) 2017 Elsevier Ltd. All rights reserved.