The materials were 26 ankle physeal injuries treated from 1989 to 1994 with least follow-up of 12 months(ranged 12 to 62 months).

The results were as follows.

1. There were 14 boys and 12 girls with an average age of 11 years(range,3-15years)

2. According to Dias and Tachdjian classification, mechanisms of injury were pronation-eversion external rotation type in 7, supination-inversion type in 6, supination-plantar flexion type in 4, supination-external rotation type in 2, Tillaux in 3, unclassified in 4.

3. Amomg 26 cases operative treatment was done in 11 cases that include 4 cases of closed reduction & percutaneous pinning and 7 cases of open reduction & internal fixation.

4. Among 26 cases, complication occurred in 4 cases, in which 3 cases were treated by closed reduction and cast irnrnobilization only or with percutaneous pinning.

5. It is most important for prevention of complication that Salter-Harris type II, III, IV fractures were to be reduced accurately and fixed adequately.

6. Because Tillaux fracture ocurs near the age of epiphyseal closure, there were no clinically significant deformity after long term follow up.

In 3 cases of Tillaux fracture, the resluts were good.