To evaluate the result of forearm shaft fracture treated by modified interlocking intramedullary nail (Acumed, Hillsbrough, IN, USA).

15 patients with fracture of radius, ulna, radio-ulna shaft treated by modified interlocking intramedullary nail from December 2003 to February 2007 were analyzed. Modified interlocking intramedullary nail has paddle blade tip and fluted rod, so the distal screw fixation was not needed but had relatively firm fixation. It has advantages including short operation time, small operation scar. The average follow up period was 8.3 months (range, 5~15 months). We analyzed the results by average union time and the functional results according to Anderson's criteria.

The mean duration of union was 9.8 weeks in radius and 11.4 weeks in ulna. The average range of motion of forearm was 74.6 degree in supination and 72 degree in pronation. Functional results assessed by Anderson were rated excellet in 12 cases, satisfactory in 3 cases. We found no complications such as delayed union, non-union, neurovascular injury and infection.

Modified interlocking intramedullary nail (Acumed, Hillsbrough, IN, USA) is a viable therapeutic alternative in the management of forearm shaft fracture.