Ten girls and 13 boys with mean age 11 years when sustaining a fracture of the olecranon were examined at a mean of 19 years after the injury. Ten fractures were displaced less than 2 mm, three 2-3 mm, eight more than 3 mm and two were multifragmental. The treatment consisted of mobilization in three cases, plaster treatment in nine and open reduction and internal fixation in 11 cases. At follow-up, 21 children had no subjective complaints while two had occasional mild pain. The upper arm circumference was thinner in the former injured extremities than in the uninjured (P<0.05). No other objective deficits were found. None had developed non-union or elbow osteoarthritis. Olecranon fractures during growth have an excellent long-term outcome.