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Background: Fractures of the pelvis and acetabulum are major injuries, often associated with hospitalization, reduced function and sometimes life-threatening conditions. Current data on nationwide incidence and treatment is sparse. Existing epidemiological studies are either single-centered or investigating only in-patients. The aim of this study was to investigate the epidemiology and treatment of pelvic and acetabular fractures in a nationwide register study including all adult patients in Sweden during 2001-2016. Methods:We used the Swedish National Patient Register to collect data on the entire Swedish population aged ≥18 years from 2001 to 2016. Variables included age, gender, fracture type and treatment. Results:We found a total of 87,308 pelvic and acetabular fractures (71% females) in Sweden during the 16-year study period and the incidence increased from 64 to 80 per 10 0,0 0 0 person-years from 2001 to 2016. The incidence of pelvic fractures increased from 58 to 73 per 10 0,0 0 0 person-years and the majority of the patients (74%) were female. The incidence of acetabular fracture increased from 8.7 to 11 per 10 0,0 0 0 person years and the majority of the patients (58%) were male. Only 2.0% of all patients with a pelvic fracture were treated surgically, as compared to 15% for acetabular fractures. The rate of surgical treatment was higher for males compared to females for both pelvic (4.4 and 1.2% respectively) and acetabular (19 and 10% respectively) fractures. Conclusion:The incidence of pelvic and acetabular fractures increased markedly in Sweden from 2001-2016. Pelvic fractures were more common among females and acetabular among males. The surgical rate was higher for acetabular compared to pelvic fractures. Major gender differences in treatment choices were found with higherproportion of men treated surgically for both fracture types, and in all age groups.

Level III, prognostic study. See Guidelines for Authors for a complete description of levels of evidence.

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