Unexplained fall warrants comp for worker

A worker was sitting in his auger truck awaiting the return of a loader truck so he could fill it up with fertilizer. When he saw the loader truck return, he stood up to get out of the truck. His next recollection was walking to the back of the truck and falling to his knees. He did not remember getting out of the truck and did not realize he had fallen until he saw gravel marks on his hand. He sustained fractures to his back and ribs. Lab results indicated acute renal failure. On the day of the accident, the temperature was in the 90s, but the worker denied feeling dehydrated. The worker also denied ever passing out and using alcohol on that day.