Based on case histories, the authors draw attention to important infectious complications in patients surgically treated for pelvic injuries. These complications were recorded in four out of 75 patients (5.3%) undergoing surgery for pelvic fracture in the period from 2001 to 2005. The chief risk factors for the development of infection included the poor state of health of a polytraumatized patient in combination with a long stay in an acute care unit, and severe trauma and bleeding of soft tissue structures in B and C types of pelvic injury. Bacteriological findings showed the presence of several pathogenic species (Enterobacter cloacae, Citrobacter koseri, Pseudomonas aeruginosa and Klebsiella oxytoca) or multi-resistant bacteria (methicillin-resistant Staphylococcus aureus).