In January 2015, the NHSN made available a document with new definitions of SSI, which came into force in the USA from that moment onwards, with important changes. The period for defining infections relating to fracture fixation procedures, regardless of the type of synthesis material used, became only 90 days, instead of one year from the data of the surgery. For better evaluation, however, for the present study, the surveillance period remains one year for defining SSIs relating to IMN.