Optimization of external fixation treatment in pelvic ring lesions by three-dimensional modelling and finite element analysis

External fixation is commonly practiced for pelvic ring fractures management. Many parameters influence mechanical performances of external fixators. Prior literature shows that the state of the art in pelvic fixator modelling has been mostly based on analysis of real prototypes made of either synthetic bone or other materials, or on cadaver specimens. Those works, although well performed, intrinsically lack in mechanical reliability due to many simplified assumptions. This study proposes a virtual 3D model of the pelvic ring with an external fixator in a 4 pins and 4 bars configuration, on which finite elements method (FEM) analysis was run. Our virtual 3D model of the pelvic ring introduces the advantage of differentiating the mechanical properties of cortical and cancellous bone along with the complex boundary conditions of major ligaments.