Finite element analysis of proximal femoral bionic nail with modified crossing points for intertrochanteric fracture
Objective To compare the biomechanical characteristics of modified proximal femoral bionic nail(PFBN)in the treatment of intertrochanteric fracture of femur by using the finite element analysis.Methods The femur full-length CT scan data provided by a healthy male volunteer aged 37 years,176 cm in height and 70 kg in weight were selected,and the materialized femur model was reconstructed using Mimics 20.0 software and Geomagic Studio 13.0 software.The Evans Ⅰ intertrochanter fracture model was established by UG NX 12.0 software,and the PFBN model(model A)was reconstructed.The PFBN model(model B)was enlarged with the angle between the locking transverse nail and the main nail,and the horizontal upward locking transverse nail PFBN model(model C)was assembled with the fracture model respectively.In Abaqus 6.14,the loading mode of 3 times body weight was simulated to obtain the maximum stress distribution of the femur model and the internal fixator,the overall displacement of the femur,and the maximum gap displacement of the broken end of the fracture under three internal fixation methods.Results Compared with model A,the maximum stress of the skew nail decreased by 11.91 MPa(12.9%)in model B,but the maximum stress of the outer side wall of the through-hole between the skew nail and the main nail increased by 12.54 MPa(7.7%)under the load of 3 times the body weight.Model C can reduce the maximum stress of the skew nail by 23.66 MPa(5.7%),but increase the maximum stress of the outer side wall of the through-hole between the skew nail and the main nail by 64.00 MPa(39.5%).There was no significant change in the overall displacement of the femur and the displacement of the broken end space under three internal fixation methods.Conclusions Compared with the PFBN before improvement,increasing the angle between the locking transverse nail and the main nail can not only significantly improve the stress distribution at the contact site of the intersection,but also not significantly increase the stress concentration area between the oblique nail and the main nail,which is conducive to the restoring of the normal biomechanical characteristics of the proximal femur and reduction of the internal fixation failure rate and complications.
Femoral fracturesFracture fixation,internalFinite element analysisProximal femur bionic nail
NETL
NSTL
万方数据
