Apprentice jockey Jack Baker was dislodged after his mount flipped over in the mounting yard prior to Race 6 at Moree.
He may have sustained some general soreness to his pelvis but initially declined treatment by ambulance officers.
The second ambulance arrived on course and have decided to transport Jack to hospital, due to concern he may have sustained an injury to his pelvis.
Update 8pm: Jack has a fractured pelvis and will be discharged from hospital this evening.