A finite element study of slipped capital femoral epiphysis (SCFE)
Shah, Hardik H
MetadataShow full item record
Dysplastic changes of an adolescent hip may increase mechanical stresses at the proximal femoral physis and result in a slipped capital femoral epiphysis (SCFE). The purpose of this study is to determine the effect of body weight, femoral retroversion, and acetabular deepening on stresses and strains at the proximal femoral physis. A computer tomography scan of a 13-year old child with SUE was used to generate a solid model of the proximal femur and physis to be analyzed using the finite element method. Body weights of 46-kg and 86-kg were considered with single legged stance. The physis is modeled using both elastic and viscoelastic tissue models using two different finite element procedures. Physis stresses and strains were found to increase with change in biomechanical factors such as greater body weight, retroversion of the femoral neck, and hyper-coverage of the femoral head. Larger maximum displacement values were found with the increase in biomechanical factors under consideration. Similar trends were found with the elastic and viscoelastic models; however the strain values found in the viscoelastic model were much higher than those in elastic model. When combined with increase body weight and retroversion of the femoral head with acetabular deepening, the loads experienced by the physis may exceed the ultimate strength of the growth plate tissue resulting in a slip. Therefore these biomechanical factors could be considered as risk factors for development of SCFE.