Abstract: Objective To evaluate clinical effect of expandable intramedullary nail in unreamed treatment of tibia fracture.Methods 31 patients with proximate tibia fracture were treated with expandable intramedullary nail and unreamed.Among those patients,4 cases were compound fracture,27 cases were closed fracture;16 cases were AO/ASIF type A,4 cases were type B and 11 cases were type C.The following-up of 9 months to 5 years(average 2 years) performed after operation.Results The fractures of 30 patients healed up and patients' functions recovered.1 case with comminuted and multiple fracture got delayed union.Conclusion Expandable intramedullary nail is an utility and satisfactory method to treat proximate tibia fracture.

Key words: intramedullary nail, tibia fracture, internal fixation, unreamed