Little Yuxin, a 2-year-old baby girl, fell from the window sill beside her bed onto a hard bed, causing swelling and pain in her left elbow. Three weeks later, she found that her elbow joint could not be fully straightened and was deformed by inversion. He went to two best provincial hospitals in Jinan for X-ray and CT examination and found that the left lateral humeral condyle was fractured and the epiphysis and distal humeral articular surface were injured, and the fracture was obviously displaced and not healed. After coming to our hospital, he was treated by Daniel Edwards Porter, an internationally renowned specialist in pediatric orthopedics and pediatric bone tumors. Under the guidance of Professor Daniel Edwards Porter, the fracture was not healed and the fracture could be moved anteriorly and posteriorly on review radiographs under arthrography. The fracture was not healed, and the fracture was movable anteriorly and posteriorly. The fracture was incised and repositioned, and a large amount of fibroplastic tissue was removed from the fracture end. The postoperative review radiographs showed satisfactory repositioning, and the cast was fixed in the flexed position of the elbow joint. If a pediatric elbow injury is not treated promptly, it may affect the development of the child, and there is a possibility of inside-out deformity of the elbow joint and ulnar nerve palsy, so parents are expected to seek medical attention carefully and treat it promptly.