Low body mass index is associated with increased mortality in patients with pelvic and acetabular fractures

•‘The Obesity Paradox’ holds true for pelvic and acetabular fractures: low BMI is associated with increased mortality in patients sustaining a pelvic or acetabular fracture. Fractures of the pelvis and acetabulum are often the consequence of high energy trauma in young individuals or fragility fractures in osteoporotic bone. They can be life-threatening or life changing injuries. No published data exists comparing body mass index (BMI) and mortality for this patient group. The aim of this study was to identify if low BMI (