Among 57 tibia! shaft fractures treated with functional method are collected. The authors report their experience with this system. They obtain 72 % of good results (unions), within normal periode of time. The angulation was smaller than 10º in 58% of cases, and never the shortening was bigger than 1' 5 cm. The subjetive results ha ve been satisfactory in the 78'9 % of patients, and 21'1 % ofthem had some disability. As complications, one patienthad Sudeck's Syndromc, and 2 patients with thrombophlebitis.