Analysis of Stress distribution of biomechanical In three-dimensional finite element model, pos-terior spinal implants

摘要: This research surveys entrepreneurship and Study of clinical biomechanics of injured instrument vertebral column is restricted to qualitative consideration. Recently with helping Finite Element Method studies are done. Quantitative instrument evaluation injured instrument vertebral column have got new shape. At most of the biomechanical studies are done on the evaluation stability of implants and vertebral column (instrument), so for determining any stress distribution, in this research five pieces of posterior spinal implants system evaluated stress distribution, maximum von mises stress and displacement with using Finite Element Method and ANSYS software which including: Cotrel Debussed Horizon, pedicure screw, made of medical titanium, pedicure screw, made of medical stainless steel, Cotrel Debussed Horizon, laminar hook, pedicure hook, device for transverse traction, DTT hook and connecting rod, that all of them were made from medical titanium, in conditions without vertebra and in all loading conditions similar to biomechanics loading include: axial com-pression, flexion, lateral bending and axial rotation. In this research, quasi static safety factor of fixation devices determined between 3 to 6, so results of this study show that maximum Von Mises stress, at all loading conditions happen on the neck of the pedicure screws, in the blade of the hook and in the middle of the rod.