|
Abstract Objective To study the biomechanical characteristics of quadratus femoris bone flap transplantation combined with internal fixation in the treatment of femoral neck fracture in young adults.Methods A three-dimensional finite element model of proximal femur was reconstructed by importing the original CT data of a healthy young volunteer into Mimics software to simulate the femoral neck fracture，quadratus bone flap implantation and cannulated screw placement.The stress of 1000 N was loaded axially on the top of femoral head to study the different distribution (positive triangle，inverted triangle)，fracture position (inferior head type，transcervical type，basal type)，anteversion angle (+5°，+10°，0°，－5°，－10°) and neck stem angle (+5°，+10°，0°，－5°，－10°) of hollow nails，and to compare the stress peak value and stress concentration point of internal fixation and femoral model.Results The stress concentration areas of femur and cannulated nail were distributed in the lateral cortex at the junction of femoral neck and femoral shaft.The stress of inverted triangle hollow nail is the lowest，the peak value was (32.2±0.93)MPa；the stress of fracture is the lowest，the peak value is (34.56±0.82)MPa；the stress of normal anatomic angle of anteversion and neck stem angle (corresponding to 0° position in the model) was the lowest，the peak value was (34.56±0.82)MPa.Conclusion The quadratus muscle bone flap has little effect on the mechanical changes of the proximal femur.The number of three hollow nails is just right and the inverted triangle distribution is better than other forms in the mechanical characteristics and reducing the collapse of the femoral head.The stress of normal anteversion and the neck shaft angle are the least.
|
|
|
|
|
|
���������� 14010702070875��