His horse One Night In Milan was four from home when the pair hit the turf after belting the hurdle.
The fall brought down fellow runner King Leon who appeared to run over O'Toole as he tried to protect himself on the floor.
Medic crews were quickly on the scene and an air ambulance arrived at the Scottish track to take the jockey to the Edinburgh Royal Infirmary.
His agent said: "I spoke to him this morning and he's fractured both sides of his pelvis.
"It's obviously not good. He's in Glasgow and I'd imagine he's going to be there for a while, as they're talking about operating on it or pinning it or whatever they do when you fracture your pelvis.
"You can't put a positive spin on it – it's going to be a long haul.
"It's a pity as he's had injuries before and things were just picking up again.
"It's a sickener, but he's a tough lad and he seems in relatively good spirits."
Source: Read Full Article