The diaphyseal fractures of radius and ulnar have many problems like nonunion, malunion and functional disturbance with conservative treatment. Therefore, open anatomical reduction and rigid internal fixation have been widely used. The plate fixation has been employed in most both forearm bone fractures and the intramedullary pinning usually used in cases of the open fractures, comminuted types, multiple fractures or poor general conditions. Seventeen patients were treated with semitubular plate and eighteen cases by the closed or open reduction and intramedullary fixation with Rush pin(the operation methods were decised alternatively) were followed up more than one year at Soonchunhyang Gumi Hospital from June 1988 to Nov. 1992 and the results were compared and analyzed clinically.

1. Those two groups were demographically similar.

2. The operation time was 65 minites in Rush pin group, 85.6 minutes in plate group and the blood loss was 37.1cc in Rush pin group,85.3cc in plate group.

3. The immobilization period and the radiologic bone union time did not differentiate two groups significantly.

4. In plated group, one nonunion and one radius refracture after union(plate removed state) were occurred.

5. Between the two operatio methods selected alternatively, immobilization period, radiologic bone union and functional results were not different significantly, but the Rush pinning method was preferred due to simple operation technique, small operation scars, short operation time, a little blood ioss, a few complications.