Supracondylar fractures of the humerus have to be defined using delimitations. In children they amount to 10-16% of the upper extremity fractures and nearly always occur as extension types. Children between the age of 5 and 10 are involved most frequently. Errors of treatment and unfavourable results of therapy demonstrate the relevant difficulties. Conservative, semi-operative, and surgical forms of therapy do not compete with one another. The frequency of the open reduction is increasing. The results of treatment with various forms of therapy do not exhibit essential differences.