Beethoven and a bone disease

Arthur is a 72-year-old retired clerk and ex-serviceman who presents for clarification about details included in a recent ED discharge summary.
Arthur was taken to ED a week ago after he was a pedestrian knocked over by a motor vehicle travelling at slow speed in a car park.
Arthur lost consciousness for about 20 minutes but subsequently made a complete recovery in the ED.
He had no other injuries apart from some bruising and a few pieces of ‘lost bark’ from his legs.