Nowadays, fractures of the acetabulum associated with low energy trauma are common in older adults. The indication for surgical or conservative treatment depends on multiple factors, such as patient age and comorbidities, type and location of the fracture, and socioeconomic environment. Regardless of the treatment chosen, none is free of complications. A patient with a conservatively treated acetabular fracture that resulted in septic arthritis of the quadrilateral joint is described below.