Background. Nonunion of the lateral humeral condyle are of the complex pathology of the elbow joint, occurring relatively often and resulting in disability of children. The treatment of nonunion of the lateral humeral condyle of humerus with cubitus valgus remains controversial. Purpose of this report was improvement of the results of surgical treatment of the nonunion of the lateral humeral condyle of humerus with cubitus valgus of the lateral humeral condyle of humerus with cubitus valgus with use of differential approach to the surgical strategy. Material and methods. We were observing 28 children (17 boys and 11 girls) with nonunion and longstanding nonunion of lateral condyle of humerus, with various degrees of severity. There were used MRI and Xray investigations for differential study of the patients divided into 3 groups in relation to stability and nonstability of the nonunion of the lateral humeral condyle of humerus with cubitus valgus of the lateral humeral condyle of humerus with cubitus valgus. Results. All 28 patients lateral humeral condyle nonunions with cubitus valgus achieved union within sixty five days after operative procedure using Ilisarovs technique. The mean postoperative humerusulna angle was 6,0 degrees of cubitus valgus. All of reverse Tosteothomies healed uneventfully, and there was no loss of correction postoperatively. The mean duration of followup was 7 years. The overall results were excellent in 15(53,5%) patients, good in 11(39,3%) patients, and fair in 2(7,2%) patients. All 28 patients lateral humeral condyle nonunions with cubitus valgus achieved union within sixty five days after operative procedure using Ilisarovs technique. The mean postoperative humerusulna angle was 6,0 degrees of cubitus valgus. All of reverse Tosteothomies healed uneventfully, and there was no loss of correction postoperatively. The mean duration of followup was 7 years. The overall results were excellent in 15(53,5%) patients, good in 11(39,3%) patients, and fair in 2(7,2%) patients. Conclusion. We believe it is reasonable to use our treatment method when dealing with nonunion of the lateral humeral condyle with cubitus valgus. These differential techniques helps to shape the distal part of humerus, thus, restoring the function of the elbow joint., Ilkhom E. Khujanazarov, Iskandar U. Khodjanov, and Literatura