Thirty-five patients with fractures of the shafts of the forearm bones were treated over a six-year period. The results in thirty-two of these patients with fifty fractures were evaluated for study. Treatment of these fractures consisted in early open reduction and internal fixation with square, snug-fitting, somewhat flexible, straight intramedullary nails which were introduced by a simple technique. Five patients were initially treated without external fixation but all other patients were immobilized in long arm casts. All fractures united promptly. There were no infections, no mortality, and few complications. Although this series is small, the results are sufficiently encouraging to recommend further trial.