X-os was created to provide innovative and efficient solutions in the specific orthopaedic field of Bone Reconstruction. The Company provide innovative, efficient and secure solutions in the orthopaedic field of Limb Lengthening and Reconstruction with internal devices.The first product, the Guichet Nail® V1, was the evolution of the Albizzia® System developed in 1986, first ever full weight bearing nail. The new Guichet Nail® Version 2 brought outstanding advancements like sports during lengthening with a strong mechanical resistance.The new Guichet Nail® Series 21 is based on the Version 2. Stronger material, multiple sizes (20 cm with a gain of 8 cm for very short femurs, etc.) and custom made implants for specific conditions are now available.Implants provide a precise and accurate gain (1/15th of a mm) fully controllable with no shortening risk. The Guichet Nail® is a fully mechanical, biocompatible and reliable system.