Objective To study the cl inical effect of expert tibial nail (ETN) in the treatment of the complex tibial fractures of type C. Methods From May to October 2008, 10 cases of complex tibial fractures of type C were treated with unreamed ETN and closed reduction. There were 7 males and 3 females aging from 23 to 50 years with an average age of 39 years. Fracture was caused by traffic accident in 6 cases, by crush in 2 cases, and by fall ing from height in 2 cases. According to Association for the Study of Internal Fixation (AO/ASIF) classification, there were 2 cases of 42-C1 fractures, 4 cases of42-C2 fractures, and 4 cases of 42-C3 fractures; including 4 cases of closed fractures and 6 cases of open fractures (2 cases of Gustilo type I and 4 cases of Gustilo type II). Results The mean duration of surgery and blood loss were 75 minutes (range, 60-110 minutes) and 55 mL (range, 20-100 mL), respectively. All the incision healed by first intension without compl ication of infection. All cases were followed up for 12-17 months (average 14 months). X-ray films showed that no breakage of nail, iatrogenic fracture, l imb shortening, and angulation deformity occurred. All fractures healed after 3-8 months (average 4.2 months). At last follow-up according to Johner-Wruhs standard for the functional recovery, the results were excellent in 8 cases and good in 2 cases. Conclusion ETN has an angular stable locking system for intramedullary nails, which can enhance axial and transverse stabil ity for the treatment of complex tibial fractures of type C. It will provide firm fixation and minimal invasion.