Background: Olecranon apophyseal fractures in children are uncommon. The bulk of these injuries are nondisplaced and therefore can be treated nonoperatively. Objective: To study the outcome of open reduction and internal fixation of olecranon fracture. Patients and methods: Our case report of a 9 years old girl who sustained left elbow trauma after falling directly over the elbow. Attended the outpatient clinic of the Department of Orthopedic Surgery, Alnoor Specialist Hospital, Makkah, Saudi Arabia, radiographs showed olecranon and radial neck fractures, olecranon fracture was displaced so we fix it with K-wire and tension band, while the radial neck fracture was treated conservatively. Results: At the 12 weeks follow-up, she achieved a complete range of motion of the left elbow with good functional outcomes and with no complications. The goal in such complex fractures is to achieve a stable congruent joint with gradual rehabilitation to reach a good functional outcome. Conclusion: open reduction and internal fixation of the olecranon fracture is the optimal treatment to achieve a complete range of motion and good functional outcome.