Man and teenager injured when thrown from horses at Marrabel Rodeo TWO riders have been injured after they were thrown from horses at the Marrabel Rodeo. A man, 29, was thrown from a horse about 3pm, suffering a shoulder and possible spinal injury. Shortly afterwards, a boy, 17, was also thrown from a horse. He was knocked out momentarily and is being treated for a head injury and possible neck injury. Both patients are being taken to the Royal Adelaide Hospital by helicopter, an SA Ambulance Service spokeswoman said. Their injuries are not considered life threatening. The Marrabel Rodeo, held in the Mid North town about 20km north of Kapunda, was first held in 1935 and is the oldest continuous rodeo in Australia.