We present an 11‑year‑old male child without any underlying disease. He was admitted to the emergency room after having felt severe pain in his right knee on kicking the ground while falling down earlier that day. Radiography showed an avulsion fracture of the lower pole of the patella and a high‑riding patella. At the next day after the injury, we performed open reduction and internal fixation surgery. After surgery, the recovery of the patient was good.