The material of internal fixation of femoral neck fracture FNS is generally titanium alloy. Femoral neck fracture FNS refers to femoral neck power cross nailing system, the new internal fixation system FNS consists of plate (+ locking screws), bolts, anti-twisting screws, whose materials are all titanium alloy. 1. Plate (+ locking screw): Angle stabilizing structure, its locking hole using locking screws, its material is titanium alloy. 2. Bolt: Its material is also titanium alloy. 3. Anti-rotation screws: the main enhancement of anti-rotation stabilization, round blunt head, can be locked with the bolt overall power pressurization, to a certain extent, to avoid discomfort caused by the outer top up. The material of anti-rotation screw is also titanium alloy. FNS system for femoral neck fracture is a new type of internal fixation system, and the materials used in its internal fixation system are all titanium alloy.