It is known that the Salter-Harris type I and II fractures of the distal tibial epiphysis usually can be treated by conservative method. But according to Spiegel, unpredictable group(type II) fractures might have more complications than expected when treated by conservative method without accurate reduction. Eleven cases in type I or II fractures were treated at the National Police Hospital between March 1992 and March 1997. If more than 2mm displacement was present compared to contralateral side after closed reduction, open reduction and internal fixation method was done and in those all cases, periosteal interposition was found on the operative field that might interrupt anatomical reduction and cause late complications such as angular deformity.