1. The case of fracture of the femoral neck here reported is the first at this Hospital in a series of 1084 cases receiving roentgen-ray treatment over the pelvis, an incidence of .09 per cent.
2. The fracture resulted from weight-bearing in the presence of marked osteoporosis, developing in a bone whose blood supply had first been impaired by arteriosclerosis, and was then further damaged by roentgen-ray therapy and fibrosis.
3. At the present time, about three years since the fracture occurred, there has been no callus formation demonstrable by roentgenograms.
4. When roentgen-ray treatment is given over the pelvis, the portals should be placed so that they do not include the region of the femoral necks. If this is unavoidable, the portals should be as small as possible.