Fig. 2From: How to get better TAD? Relationship between anteversion angle of nail and position of femoral neck guide pin during nailing of intertrochanteric fracturesSimulation operation and mathematical analysis. a, femoral and intramedullary nail model; b, measurement on curvature radius of femur; c, fluoroscopycoordinate system O-XYZ, guide pin trajectory co-ordinate system O1-X1Y1Z1; d, The plane of the femoral neck guide pin is within the scope of the red line; e, calculation on PSA of and anteversion of guide pinBack to article page