Pelvic ring fractures are common and often the result of high energy trauma but also sometimes of lower energy trauma in older patients. A good classification and description of the fracture is essential to the choice of treatment.

The classifications used to describe these fractures are numerous (Tile modified AO, Young and Burgess, Letournel, Rommens) and of a descriptive order more or less depending on the lesion mechanism allowing some to orient the surgical reduction technique. However, none of them helps with the choice of surgical or functional treatment, which is currently based on obvious notions of instability and / or displacement of lesions and, by habit, all different services.

In addition, the complexity of these classifications leads to poor reproducibility of these.

A new method for analyzing unitary lesions has been developed in the Orthopedic Surgery department of the Paris Saint-Joseph Hospital Group with a rating system which determines the indication according to the score.

Teaching this new method of analyzing pelvic ring fractures would simplify decision making between surgical and functional treatment.

Inclusion Criteria:

• Patient aged> 18 years
• Patient treated or followed within the Orthopedic Surgery service of the GHPSJ for a pelvic ring fracture
• complete initial imaging patient record (scanner)
• French speaking patient

Exclusion Criteria:

• Patients under guardianship or curatorship
• Patients deprived of their liberty
• Patients objecting to the use of their data for this research
• Patient with isolated sacral or acetabular fracture
• Absence of scanner during the initial assessment

Patients were hospitalized or consulted in the Orthopedic Surgery service of the Paris Saint-Joseph Hospital Group, for the management of a pelvic ring fracture from January 2015 until September 2019.