Design Retrospective study. Setting Level I academic Trauma Center. Patient selection criteria Adult patients with femoral shaft fractures in which a bilateral computed-tomography (CT) scan of both femurs was performed, with a two years minimal follow-up. Outcome measures and comparisons Criteria related to the patient and the fracture were studied. We fixed the following angles, i.e. 10 degrees and 15 degrees, as references for calculating the RM.