Eighty-one cases of femoral neck fracture were studied with type II of the Hayashi's quantification analysis for a prediction of late segmental collapse. These cases in which the follow-up results were known were used and the age at the onset was 58 years in an average renging from 12 to 79 years. For factors, ten items without Garden's stages have been used, becases the late segmental collapse was observed in 32.5% of the cases with stage I & II including 29 old fractures.
The results show that the most correlative factor with a late segmental collapse was a fracture angle of Pauwels and the prediction of the wllapse was possible with a misdiagnosis rate of 28.5%, however, if an analysis was performed with limited conditions to fresh and old age fractures, it was considered that Garden's stages ware problay one of the most essential factors in this fracture.
