Retrospective Evaluation of Guided Growth Plate System Plus's Safety and Clinical Performance for the Treatment of Lower Limbs Deformities.

Guided Growth Plate System Plus (also named 8 Plate Plus) has been developed to redirect long bone growth and is used to correct gradually angular deformity in growing children. The device is indicated for the treatment of specific conditions/pathologies between which: * deformity of the knee (femur and / or tibia) in varum/valgus or flexural extension; * deformity of the ankle in varum/valgus or plantar flexion; * femur and/or tibia length discrepancy. Objectives: The primary objective of the clinical investigation is to assess the safety of the 8 Plate Plus. The secondary objective of the clinical investigation is to assess the clinical benefit of the 8 Plate Plus. The Investigator will include in the study the patients who at the screening visit (Visit 0) will meet all the selection criteria. It is understood that, given the retrospective nature of the study and given that the consent of eligible patients has been collected in advance, the patient should not attend the screening visit or subsequent visits. In addition, during the screening visit (Visit 0) the Investigator will collect demographic data and patient history. Subsequently, the data of interest relating to the surgery for the application of the plate (Visit 1) and the period of treatment will be collected, or related to the 2 follow up visits (Visits 2 and 3) carried out until or at the removal of the plate/ plates (Visit 4). The course of treatment will be monitored as per clinical practice and will then be collected data that correspond to the follow-up visit planned on average 4 months after removal of the plate/plates (visit 5).