There are several possible bases for liability in your amusement park accident case:
Negligence: an amusement park is responsible for injuries to park visitors if it failed to keep its rides or premises safe. This can include rides that were not maintained or inspected. Negligence can include a park employee that fails to provide proper warning about a ride or operates a ride in such a way as to cause harm.
Product liability: Product liability claims may be made if the ride itself is found to be inherently dangerous even with proper maintenance and inspection.
Premises liability: property owners must demonstrate that they exercised reasonable care in the maintenance and management of the facilities. If they have not done so, they may be held liable for injuries that took place on their premises.