The effect of cannulated screw placement angle in the management of femoral neck fracture

Fixation with cannulated screw was widely accepted for management of femoral neck fracture. However, the angle of placement cannulated screw for management of femoral neck fracture still controversial. The present study aims to investigate the mechanical behavior of the cannulated screws with two different angles of placements which are 135o and 150o in inverted triangular configuration for management of femoral neck fracture via finite element method. Therefore, the 3D model of a proximal femur consist of femoral neck fracture was constructed from CT data images using medical image processing software. The von Mises stress distributions on the cannulated screws were compared between each screw angle placement. The result showed that the cannulated screws in inverted triangle with 135o of placement angle have better stress distributions than 150o placement angle