A study was made of the results of immediate repair and controlled mobilization in 156 severed flexor tendons in 68 patients occuring over an 18-month period. Eight patients with 16 tendon injuries could not be followed. Results were obtained from examinations done 6 weeks to 18 months (mean, 5.3 months) after repair. Thirty-one of the 60 patients were less than 20 years old, and 44 of the 60 were less than 30 years old. Seventy-nine (56%) of the injuries occurred in the area known as "no man's land"; 28 patients with repair of tendons in this area were rated by our standards as "excellent" or "good"--75% of patients as compared to 84.4% for the results of repair in other areas. In one fourth of the cases of severance of both tendons, because of local conditions in the wound, the superficialis was excised, but in all others it was repaired.