TWO EARLIER papers1described how four types of ankle fractures in different (two to four) stages were produced, how their mechanism was established by experimental surgery, and how they were pathologically determined by dissection and genetically classified by experimental roentgenography. Study has been made on clinical material to verify the fact that the four types experimentally produced and classified correspond to the clinical fractures of the ankle and that the genetic roentgen diagnosis and the genetic reduction technique found by way of experiments can be used in the treatment of fresh ankle fractures. GENETIC ROENTGEN DIAGNOSIS Fractures of bones of the leg were included in the clinical material in order to insure that all fractures properly belonging to the ankle-fracture group are dealt with, because in some cases of ankle fractures the fibular fracture is found so far proximal to the ankle joint that the clinical department may not