Falls could be predicted in older people three weeks before they happen, according to new research using sensors in the home to monitor the occupants' gait.
The ground-breaking system, devised by scientists in the US, can alert medics to subtle changes, allowing them to intervene before a potentially lethal stumble.
And early tests show the system - in which movement sensors in the walls measure walking speed and length of stride - can help people stay in their own homes for longer.
Experts from the University of Missouri, found that even small changes can help health professionals predict if an elderly person is at risk.
They found that when walking speed drops by 5.1 cm per second, older people have an 86 per cent chance of falling within three weeks, compared with 20 per cent if there is no change. Researchers also found that a drop in stride length of 7.6cm predicted a 51 per cent chance subjects tripping within three weeks.