Aims: Several surgical methods to treat varus knee deformities in young patients are known. In the present study the surgical procedure and the medium and long term results of the treatment with opening wedge valgus high tibial osteotomy are analysed. Methods: 27 cases in 11 patients are analysed. Average age: 21 years. 5, ales and 4 females. 8.3 years of follow-up. Surgical procedure: ßuoroscopic control. References: femoral head, knee centre and ankle centre. Osteotomy: Opening wegde valgus high tibial osteotomy. Correction: alignement according tomechanical axis. Bone grafting: autogenous bone grafts and osteotoconduction material. Osteosynthesis with a plate. Knee dynamic orthoses until fusion is achieved. Results: No pre or post-operative complications. Consolidation before 2.5 months in all cases with early full weight-bearing. Results analysed according to the scoring scales: Excellent/Good: 24 cases, Fair: 3 cases, Poor: 0 cases. Conclusions: Opening wedge valgus high tibial osteotomy is an excellent method to correct varus knee deformities in young patients. It does not usually present complications and the correction achieved in the post- operative persists in time in all our cases.