Sometimes older ladies can have osteoporosis, which is a weakening of the structure of bone,
and that may have been why her
femur disintegrated. Now, sometimes if a big bone breaks, if it damages a nearby artery, why, that can cause issues with how much blood and thus oxygen is getting to the brain. But if they did a scan and also if they are competent ER folks, they should know the difference between a stroke and a bleed-out in the leg.