Biomechanical behavior of bone tissue in spine instrumentation.

Background: The mechanical fixation of the spine in patients with osteoporotic vertebral degeneration is a challenge for surgeons, the vertebrae selected to insert the screws may fail, endangering health and even patient's life.

Objective: The objective of the study was to study the effect of the variation of the bone density in the bone-screw interface from a three-dimensional model of the lumbar section.

Materials And Methods: The finite element method was used to model the behavior of the lumbar vertebral section when applying compression loads.

3D patient-specific model of the tibia from CT for orthopedic use.

Objectives: 3D patient-specific model of the tibia is used to determine the torque needed to initialize the tibial torsion correction.

Methods: The finite elements method is used in the biomechanical modeling of tibia. The geometric model of the tibia is obtained from CT images.