theonlyone, you should report this to CSCI as already suggested and I would have a word with the ward staff as well. Accidents do happen but the staff at the care home are not medically qualified and so should have had him checked over by either GP or paramedics, Leaving it 3 days is unacceptable in my opinion. From a previous post the manager got sidetracked by the cost issue.
You could also discuss his future care needs with the Social Work Dept at the hospital. Personally I would want him moved and it may be that his needs have changed because of the fall