Researchers are using robotic skeletons designed to help people with spinal cord injuries stand up and walk in a world-first trial in Sydney.

Jess Collins, who was the first person to participate in trial, says doctors told her she would never walk again after her near-fatal surfing accident last year.

Physiotherapist Jodie Marquez from the University of Newcastle says their exoskeleton device can help build muscle strength and improve quality of life.