Abstract: To analyze and evaluate the efficacy of interlocking intranmedullary in the treatment of 26 patients of the complex femoral fractures.Patients were followed-up for an average of 11.4 months (ranged 1 to 26 months).The time for fracture union averaged 16 weeks in fresh fracture and 23 weeks in old.The excellent and good results rated 88.5%.It shows that interlocking intranmedullary nail can treat in many kinds of femoral fractures,such as the complex  comminuted,fragmental fractures and old fractures after fixator failure.

Key words: interlocking intranmedullary nail, femora, fracture fixation