In the 1950`s, he designed the external fixator. Dr. Gavriil Abramovich Ilizarov started the first fracture treatment in 1945 with this device. Ilizarov observed changes in the fracture line due to lengthening by observing the formation of a new fracture union in the fracture line as a result of accidentally loosening the screws on the rods of a patient who was fastened with the Ilizarov external fixator for fracture treatment. In 1969, he published his 10- year experimental work in his essay compact The course of compact bone reparative regeneration in distraction osteosynthesis under different conditions of bone fragments fixation experimental (experimental study). In this published study, he reported distraction osteogenesis and results in 65 dogs. As a result of the experiments; Stable fixation under optimal conditions allows low-energy osteotomy to allow 5–7 days in addition to waiting for 6–8. described an extension of 1 millimeter (mm) in the osteotomy line after 3–4 days. This technique of Ilizarov was later applied in humans and became widely used as Distraction Osteogenesis.