Preceding and subsequent high- and low-trauma fracture patterns-a 13-year epidemiological study in females and males in Austria.

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Little is known about the impact of the skeletal fracture site in conjunction with the severity of a past fracture (high- or low-trauma preceding fracture) and its effect on future fracture risk. Patients with de novo high- and low-trauma fractures admitted to seven large trauma centers across Austria between 2000 and 2012 were stratified into sex and different age groups. Kaplan-Meier estimates, Cox proportional hazards regression models (HR), and likelihood calculations estimated effects of age, sex, and the anatomic region on the probability of a subsequent fracture in the same patient. Included in the study were 433,499 female and male patients at an age range of 0 to 100years with 575,772 de novo high- and low-trauma fractures. In the age range of 54-70years, subsequent fractures were observed in 16% of females and 12.1% of males. A preceding high-trauma fracture was associated with 12.9% of subsequent fractures, thereof 6.5% of high- and 6.4% of low-trauma in origin, usually at the hip, humerus, or pelvis. The highest effect sizes were observed for femur, humerus, and thorax fractures with hazard ratios (HR) of 1.26, 1.18, and 1.14. After splitting into high-trauma preceding and subsequent low-trauma fractures, the femoral neck (HR=1.59), the female sex (HR=2.02), and age (HR=1.03) were discriminators for increased future fracture risk. Preceding high-trauma fractures increase the risk of future low-trauma non-vertebral fractures including hip. For each patient with a fracture, regardless of the severity of the trauma, osteoporosis should be taken into clinical consideration.