The purpose of this review is to describe a more precise type II classification of Boyd and Griffin (1949). It seems possible, according to the different intertrochanteric fractures, to describe three sub-groups. Classification takes account the most recent description of the coronal plane fracture (Briot 1980) and the behaviour of the compressed cancellous bone (Ender 1970). It allows a better understanding of what is called an unstable hip fracture and a better physiological approach.
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