## 1 Introduction
A very important variable that affects the geometric planning of the OWHTO and that we will take into account, is the optimal position on the medial-lateral articular line through which to pass the corrected mechanical axis of the tongue. In the case of healthy subjects, this position is located in the middle of the knee joint, i.e., 50% of the distance measured from the medial to the lateral, and, therefore, normally, this should be the target to achieve after surgery [18]. In reality, in surgical practice, in order to realign the mechanical axis of the foot, the angular correction is not made through the knee joint, but an overcorrection is made. The overcorrections made are practically between 55-75% [18, 19, 20, 21, 22, 23, 24, 25, 26], measured in the direction mentioned above, and will have as a consequence a load transfer from the medial to the lateral. From the value point of view, in the paper [27] it is highlighted that, for every 1 mm of transfer of the position of the intersection point of the mechanical axis with the medial-lateral articular line, a load transfer of up to 41 N takes place from the medial compartment to the side. The reasons for this overcorrection would be the following: biomechanically, anyway, a higher load is taken on the medial (60%) than on the lateral (40%); it also takes into account the increased wear of the medial intraarticular cartilage and the patient's predisposition to develop OA again with the involvement of that area. Under these conditions, a discharge from the medial compartment is welcome. Many studies recommend overcorrection through a point called the Fujisawa Point located at 62.5% [18,19], measured from the medial to the lateral area. Other approachescorrelate cartilage wear with overcorrection as follows: 55-57.5% for one-third worn cartilage, 60-62.5% for two-thirds worn cartilage, 65-67.5% for the entirely worn cartilage [20]. There are also studies that recommend higher overcorrections: 71.93% [21] or even 75% [22], but these lead to other dysfunctions. In consequence, another purpose of our study is to establish which is the optimum position of the point on the medial-lateral articular line through which the mechanical axis of the foot will pass after the OWHTO in order to obtain the best biomechanical stability of the joint. The objectives of the research are the following:  
* The realization of a parameterized CAD modeling of the human tibia, as a set of entities with different mechanical characteristics in accordance with the real structure of the tibia. * The virtual simulation of the OWHTO, with the realization of the \"operated tibia\" models in different combinations of the parameters that characterize the geometric planning of the OWHTO. * Modeling of the flat tibia-osteosynthesis assembly after surgery. * Performing analyses by the finite element method and the Taguchi method to optimize the geometric parameters of the OWHTO. * Performing finite element analyses applied to the tibia assembly operated by OWHTO and satisfactory TomoFix osteogenesis, focused on the medial-lateral load transfer due to changes in the positioning of the point of intersection between the medial-lateral articular line and the corrected mechanical axis.