An uncommon fracture of the proximal tibial epophysis can be classified into 5 types based in the mechanism of injury and the relationship of the fracture line to the physeal plate. The separation extends along the physeal plate and then through a portion of the metaphysis, Salter-Harris type II is the most common physeal fracture. We experienced a very rare case of bilateral flexion type Salter-Harris type II fracture of the proximal tibia, which was treated by long leg cast. At six weeks fusion is complete at the proximal tibial epiphyses of both knees, and the range of motion is full at follow-up six months