Abstract:

BACKGROUND: New mechanical classification of femoral fractures breakthroughs the previous simple muscle stretch classification. It can provide further research direction for the internal fixation in mechanics.
OBJECTIVE: To discuss the stress distribution of the femur under different states.
METHODS: Three-dimensional reconstruction of the femurs was performed by the finite element method. The different parts of the femur were constrained and their stress distributions were analyzed to simulate the concentrations of stresses under different states and to provide advices for clinical internal fixation of femoral fractures.
RESULTS AND CONCLUSION: Stress was concentrated at the middle femur under the condition of walking upright, and a spiral stress concentration area was at the lower femur. Under kneeling position, the stress was increased at the inferior segment of the femur, especially at the condyle. Under sitting position, the stress was mainly concentrated at the femur neck. Stresses are concentrated at different segments of the femur under different states, thus leading to different types of femoral fractures. The results provide scientific basis for internal fixation to reduce stress and prevent fixation failure.