The humeral shaft fracture was managed by conservative treatment conventionally. But recently tendency of surgical treatment has been increased. The use of closed intramedullary interlocking nail was recently applied to humeral shaft fracture.

The retrospective review was undertaken of 17 patients with humeral shaft fractures treated with the use of closed intramedullary nail during the period of April,1992 to Februaty,1994.

The findings are as follows.

1. All were treated with closed nailing and static licking was performed.

2. The union was achieved in 16 cases(94%) and average union time was 2.5 minths.

3. There was one radial nerve injury by initial trauma. But there was no post operative radial nerve injury.

4. According to the range of motion scale by Brumback. there were excellent result in 11 cases. good result in 4 cases, poor result in 2 cases.