Orthoses are medical - mechanical devices which with the help of external forces, repair, improve or preserve the particular function of motion. Most of them are called by the part of the body that they include with a possible indication of function. They are used on damages of body functions (joint instability, pain, reduced muscle strength or flexibility of the joints) and in the damages of body structure (fractures, partial or complete cessation of tendons, ligaments nervs, skin) that can have different causes (traumas - of bones, joints, muscles; damage of the central or peripheral nervous system, congenital abnormalities, disease - for example rheumatoid arthritis). Orthoses have a wide range of use and today they are so high-quality that can actively improve treatment and it is incorrect opinion it is used only in the course of rehabilitation. In rehabilitation orthoses is used to improve function. In their preparation is necessary good knowledge of anatomy, function and biomehanic movement of a certain part of the body. Modern methods of measurement with high-quality materials and creating tools, can accelerate the whole process of supply with orthoses and make it easier. By improving the function of one part, we must always be careful of how it will affect on other parts of the body, because they are all correlated with each other. Before prescribing orthos we always need to have it inspected by a specialist who will, together with other members of multidisciplinary team, set the goals of rehabilitation. Especially for the preparation of corrective orthoses for the spine, it requires sustained cooperation of doctors, engineers of prosthetics and physiotherapist. As the orthotics is closely associated with the progress of technology, we should always keep track of what is happening in the world in this area to be able to prescribe to the patient the best possible orthosis.