WHILE DIGGING IN AN AREA WITH A LARGE""TOE"", A BOULDER FELL FROM ATOP THE TOE ONTO THE CORNER OF THE FEL BUCKET. THE FALL WAS NOT FROM A GREAT HEIGHT BUT THE SUDDENESS OF IT AND THE MASS OF THE BOULDER CAUSED THE FEL TO BE JARRED AND THE EE WAS JARRED ALONG WITH IT. THE EE HAD SOME PAIN AT FIRST BUT DID NOT MENTION IT UNTIL LATER IN THE DAY WHEN IT GOT WORSE.