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Biomechanics of Bone-Fracture Fixation by External Unilateral Mechatronic Ortopaedic Fixators

Choromański W., Leśniewska A.

Machine Dynamics Research

2010

Vol. 34, No. 2

78-86

In the external fixation of fractured bone by means of bone-external fixation device fastened to the bone, an on-going concern has been determined the stress distribution at fracture as well as at fixation sides during the whole fracture healing process. In order to address this problem, it has been proposed to use Uunilateral Mechatronic Ortopaedic Fixators. Accordingly, the stress distribution has been computed by finite-element analysis. The analyses were performed under an axial, variable loaded boundary conditions, different fracture sizes and different value of a distance between bone and external fixator device to study the stress distribution. The results show that stresses in the external fixator device are higher at the beginning of fracture healing process, afterwards gradually are reduced throughout the healing process. The analyses were carried out using the commercial package CATIA P3 V5R11. This allowed to accomplishes three-dimensional model more similar to the geometrical architecture of the long bone as well as of the external fixator. However, the accuracy of the results depends not only on the quality of the model geometry but also on the material properties assigned to the model components as well as on the accuracy in the simulation of the finite element model and the optimized mesh generation.