RESUMEN
46 patients with occult fracture on middle third of tibia shaft due to many causes were surgical treated by intramedullary fixation with Küntscher nail: 37 patients were treated at Viet Duc Hospital from January 1996 to July 1999 and 9 patients were treated at Hospital No 103 from April 1993 to July 1999. Outcomes: very good 27 cases (84.37%), good 5 cases (15.63%). Advantages of this procedure were firm fixation; early rehabilitation that helping bone union; easy to use so that it can be used at all hospitals; dissection of periosteum in this procedure is less than fixation with screw that making less vascular damages and better healing. Disadvantages were higher risk of infections, slower bone union, and this procedure can’t be used for fracture of upper or lower third of tibia shaft