David Casey avoided serious injury after being unseated on the way down to the start before the first race at Ballinrobe last night.
Casey had been due to partner Sir Whinstone in the Western People Maiden Hurdle, won by Willie Mullins' Rattan, a first winner for Paul Townend on his return from injury.
However, just after getting out onto the course Casey was dislodged and taken off to hospital holding his arm. Sir Whinstone was withdrawn.
"I've just left the hospital and thankfully there is no serious damage," said Casey.
"Everything is fine, it's just badly swollen, I've had it X-rayed and nothing is broken.
"I'll be fine for Punchestown."
Shay Barry then stepped in to replace Casey on Fair Dilemma in the Ba Morley Memorial Handicap who fell at the last.
In getting up, Barry was hit by an oncoming horse and taken to Castlebar Hospital for X-rays.
Dr Adrian McGoldrick, chief medical officer for the Irish Turf Club, said: "I've not managed to speak to Shay myself this morning, but he has been discharged from hospital.
"Thankfully his X-rays were clear but I imagine he is pretty badly bruised as it was a nasty incident."