Numerical Simulation And Analysis Of Slipped Capital Femoral Epiphysis In Child Bone Growth

Slipped capital femoral epiphysis is the disease that the growth plate cartilage separate from normal location in proximal femur.It is the common joint disease in children.The clinical manifestations are that the patient feels pain in hip and knee,and walk uncomfortable.Slipped capital femoral epiphysis may leads to a series of serious complications,femoral head necrosis,cartilage dissolution,leg-length inqueality and hip arthritis.However it is not known that the medical reason leads to slipped capital femoral epiphysis.The more and more research shows that biochemical and biomechanical factors common leads to the occurrence of the disease.Therefore,it is important significance to study the cause of the disease in mechanics.The article is divided into two parts to study slipped capital femoral epiphysis.First it is to analysis the slipped risk factors caused by the bone material in bone remodeling process.Then it is to analysis the slipped risk factors cause by the bone shape in bone growth process.In the paper the simulation obtains bone remodeling simulation and bone growth simulation respectively written in the second chapter and third chapter.The bone remodeling simulation has two important significances.First the bone remodeling simulation achieve the really distribution of material properties.Just based on the really distribution,it is reliable to numerical analysis the bone elements.Second in order to simulate the shape deformation process of the growth plate,it is need to obtain real step load on the growth plate.However the real step load can be obtained from the result data of the bone remodeling simulation.The growth process of the growth plate of child from 7 to 10 years old is simulated in the paper.And the simulative shape of growth plate is compared with the shape of the real growth plate.The simulative results are reliable verified by the comparison.Finally the internal remodeling simulation and external growth simulation are performed on the growth plate.Based on the simulative results of internal bone remodeling and external bone growth,the risk factors of slipped capital femoral epiphysis are analyzed in following aspects.First the material of bone tissue is acted as the subject.The bone elastic modulus are assigned as actual value and the value increased and decreased by 10% to understand the relationship between bone elastic modulus and Mises stress of growth plate.In the section,the subjects include femoral head cartilage,femoral head cancellous bone,femoral cancellous bone,femoral cortex and growth plate.The bone elastic modulus of these bone tissues are assigned as their actual value and the value increased and decreased by 10%.Through the comparison of the result data,the article present the risk factors that may leads to slipped capital femoral epiphysis in term of elastic modulus of bone tissues.The second part is to understand how the shape of growth plate effects the joint disease.The warping of growth plate can be controlled by writing the function expression of bone growth.The purpose is to study the relationship between different warp degree of growth plate and slipped capital femoral epiphysis and presents the risk factors that may leads to slipped capital femoral epiphysis in term of shape of growth plate.At last the real gait load is applied to the growth plate,the growth plate model runs the bone remodeling program and bone growth program to analysis that the gait load may loads to the impact on growth plate.The stress curve caused by gait load is also given.The significance of the article is to know the cause of slipped capital femoral epiphysis on bone material and bone shape aspect based on simulative results of bone remodeling and bone growth.The paper provides the date to prevent the disease.