Abstract: Objective To study the healing effects by applying femoral neck with side hole hollow nail combined with bone cement for the promotion of fracture. Methods 58 adult femoral neck specimens were seletced based on the maximum axial pull output (F-Max) in experimental group, 12 femoral neck in bored after the hollow screw directly into the center of the axial, the other 12 femoral neck in the center of the axial drilling will polymethacrylate again after infusion of bone cement into side holes with hollow screw. To pull out the experiment, the hollow nail pulling power of the maximum axial and screw in the process of cycle resistance to bending experiment in loose could withstand the maximum load were determined. Results In PMMA bone cement injection hole hollow nail was significantly higher than that of the maximum axial force ,which was higher than pure hollow nail maximum axial pull output, the difference was statistically significant (P<0.05). Conclusion For hip osteoporosis fracture, the side holes by using methyl methacrylate hollow nail fixed the fracture end, can significantly reduce the risk of femoral head loose, falling off, and improve the stability of the fixed the fracture end, accelerate fracture healing.

Key words: femoral neck, side hole hollow nails, polymethyl methacrylate bone cement, biomechanics