Objective: to determine the biomechanicalbehavior of the bone-Dynamic Hip Screw plate and the bone- monolateral externalfixator sets and their influence on the distribution of stress before, duringand after the removal of implant.
Methods: the study was based on the finite element model, taking intoaccount the muscle actions and the body weight at the monopodal phase of thegait cycle as well as the anisotropic properties of the cortical tissue andthe isotropic properties of the spongy part of the bone. A comparative studywas also conducted on the stress condition of the implant and its influenceover changes in the stress-deformation condition of the bone as long as theimplant remains in the bone and after being removed.
Results: the variation percentage of the areas under traction and compressionin the healthy bone was estimated for the loading condition in the monopodalgait along with the acting stresses in each element of the implants analyzedduring the consolidation of fracture and the their influence in the distributionof stresses in the bone during the functioning of implant and after its removal.
Conclusions: regarding the mechanical behavior of the Dynamic Hip Screwimplant and the external fixator, the most unfavorable situation was found inthe first system since stresses were greater than the material's elastic limitin the lower fixation screw. A slight variation of the bone stress was noticedafter placing the implant. When both implants were removed, there was a riseof compressive stresses at the borders of the holes they fixed.
