The authors analyse the results obtained in 120 cases of supracondylar fracture of the humerus in children by reduction under general anaesthesia followed by fixation of the elbow in flexion, the wrist being placed close to the neck. The biomechanical basis of this technique is reviewed. It is essential that the posterior periosteum should be intact. Technical details are given together with indications. Seventy out of 120 fractures were reviewed after 2 years. There were 82 p. 100 of good results in grade II fractures. Six out of 24 grade IV fractures showed secondary displacement.