The internal gonarthrosis femora-tibial on the Varum knee is always associated to a metaphysis varus. The correction of this deformity must be held in the locate place, or in the internal metaphysis region of tibia by opening tibial osteotomy.

+The use of this system cross off any classic inconvenience of the opening osteotomies and allows:
-Adjustable and accurate opening in all stages of surgery
-A solid osteosynthesis
-Early reeducation without post-operative standstill