Finite Element Analysis Of The Effect Of Osteogenic Index On SCFE In Children

The slip of femoral head is also known as slipped capital femoral epiphysis(SCFE) which is the most common orthopedic hip disorder occurring in the10~15 years old obese adolescents, especially boys, and ten percents of patients are acute disease. Through the technique of CT image analysis, it is found that the characteristic of SCFE is based on the slip of femoral epiphysis through the femoral growth plated(femoral epiphysis plate), according to the results of most clinical cases, the epiphysis of patients have different degrees of moving inward and backward from femoral growth plate, however, the femoral epiphysis is maintain wrapped in the acetabulum. The reason is unclear at present,but a large body weight and the change of mechanical properties of the femoral growth plate may be the reason that leads to SCFE. The incidence rate increased in recent years in China, it is likely occured no hemorrhagic necrosis and atrophy of epiphysis if this disease is not treated in time. Thus, deepening the understanding of slipped capital femoral epiphysis is important for the treatment of this disease. In recent years, with the deepening of the study of the slipped capital femoral epiphysis, many experts and scholars proposed their own viewpoint about the cause of the slipped capital femoral epiphysis, they think that the abnormal distribution of OI(osteogenic index) is an important cause of SCFE.In this paper, a finite element model of the proximal femur is generated by the CT data of children's proximal femur, and this finite element model can provide us a basic understanding of the structure and biomechanical properties of the proximal femur in children. In order to calculate the osteogenic index distribution, we use programming language “Fortran” to write a program to accomplish this goal which base on the finite element software. Then, applying the 82 hip joint forces during normal walking on the femoral head. Later,changing the value of 82 forces to simulate the effect of overweight and obese children's body weight on osteogenic index. Changing the acting position of the82 forces to simulate the effect of limping on osteogenic index. This paper also change the Young's modulus of femoral growth plate to simulate the effect of Young's modulus on osteogenic index distributions. Last, our results are compared with the result of the domestic and foreign literature, and higher consistency is obtained.