The "monolateral external fixation system for trauma and orthopaedics" MeFiSTO makes the external reduction and stabilization of bone fractures possible. The component system allows a broad area of application, different modules can be added to the basic instrument to extend the application (fracture reduction, segment transport, angle correction). The system is compatible with the Synthes external fixation systems. The components are biocompatible and sterilizable. The colour coding facilitates the use of the instrument, which can also be handled by the patient. The product graphic was optimised for the improvement of the handling. The mat surface prevents dazzles during the surgery. The compact design allows a good patient comfort. The product can be operated with one key.