The "Vertigo" or "Le vertige" ride at Expo Québec had people jump seven metres from a hydraulic platform onto an oversized inflatable mattress.
A nurse at the emergency room of the Hôpital de l'Enfant-Jésus told Radio-Canada that the ride has caused several injuries including different types of bone fractures.
The CHU de Quebec, representing five hospitals in the Quebec City area, also confirms it has called for the closure of the attraction due to the high number of patients treated for injuries.
Organizers say the attraction will remain closed and will be replaced.
The ride debuted in Quebec at the summer fair in Lévis under the name "Saut St-Hubert " where there were no incidents reported.