Injured rider Kate Nipperess has had some good news with doctors ruling out the need for a second spinal operation.

Nipperess underwent surgery on Thursday after suffering multiple injuries in a freak accident when the horse she was riding collided with a riderless horse at Warwick Farm trackwork earlier in the day.

While Racing NSW safety officer Maurice Logue was at the hospital on Friday, doctors advised Nipperess her spinal cord now had space around it after the operation to release pressure caused by a displaced vertebra.

Logue reported scans showed a clot on her spinal cord which was expected to dissolve given time.

Although she is still unable to move her legs, Nipperess was starting to feel pressure on them.

Her partner, trainer Craig Ritchie, said she was in good spirits and the incident was a freak accident.

Nipperess also suffered multiple rib fractures, a small neck fracture and a lung injury in the incident.