Abstract:

BACKGROUND: Skeletal biomechanics digital finite element analysis can reduce experimental cost with finite element model as virtual sample, which can be used repetitively. 
OBJECTIVE: To explore a method of building three-dimensional finite element model of pelvis with 3D finite element software, and analyze the stress around pseudo-acetabulum of developmental dislocation of hip (DDH) using the model.
METHODS: Using DDH patient’s pelvic CT data, pelvic 3D object was reconstructed in the software of Mimics 10.0, and the surface was meshed. In Ansys10.0, the body meshing was performed, and the files were imported to Mimics10.0, which gave the material properties. The pelvic finite element model of DDH was established. In Ansys10.0, single limb standing was simulated, and static load was applied on the pseudo-acetabulum articular surface. The preliminary analysis of the model was made.
RESULTS AND CONCLUSION: Based on DICOM format CT data, a semi-pelvic three-dimensional finite element model was established which included a true acetabulum and a pseudo-acetabulum. The model included 147 167 nodes and 113 898 elements. The pseudo-acetabular was close to sacroiliac joint. In single limb standing, pelvic stress concentrated in the bone between pseudo-acetabulum and the sacroiliac joints. Software of Mimics and Ansys provides a simple and effective method of 3D finite element modeling. This 3D finite element modeling method is also applicable to other bones. This finite elements method can effectively simulate the human bone stress under physiological and pathological conditions, and provide clinical reference and guidance.