Scaphoid fractures are often caused by a hard fall with the wrist in a specific position, usually wrist extension.

“there's mainly a hard fall with the just the right position of the wrist where it's leveraging on that and it's that scaphoid spans the two rows of bones in the wrist that we call the the distal row and the proximal row of these arcs of Bones and um and it spans that so it gets leveraged on in a certain way with certain positions and then a directed Force usually it's a wrist extension Force”