Failure of the internal fixation may develop in femoral neck fractures, because most of the patients are aged and osteoporotic. The correlation between fracture stability and union has been shown in many studies. Dedicated screws were designed or augmented with different materials (PMMA, Calsium phosphate) to increase the holding power at the femoral head for better fixation. The osteonecrosis of the femoral head may develop after applying PMMA. The purpose of the work was to evaluate temperature increasing after using PMMA in femoral neck fracture fixation. 24 human femoral heads were used in our study. In study group 7 mm cannulated screws with holes between the threads augmented by 1cc cement were used. In control group no cement was applied around the screws. Mean 1.3ºC temperature elevation was detected in the study group when comparing with the control group. According to these results we can use PMMA in internal fixation of femoral neck fractures.