The volume is an overview of the basics of biomechanics of circular extrernal fixation and is based on a system of coordinates that allows safer insertion of K-wires and half pins into the bone. The Author includes also a new classification of this device, a collection of terminology, a description of relevant equipments and presents the protocol of external fixation using accurate description of the method in order to avoid mistakes. The book presents a numerical codified system for the application of transosseous wires for the Ilizarov device. The volume could be a manual for orthopaedic surgeons interested in limb reconstruction, limb lengthening and others.