EE STEPPED INTO A SCOOP BUCKET TO TAKE DOWN A SIGN WHILE RETRIEVING RAIL. EE STEPPED DOWN ABOUT 16-18"", STEPPED ON SIDE OF RAIL AND TWISTED KNEE. INITIAL DIAGNOSIS WAS A SPRAIN BUT MRI SHOWED TORN MENISCUS. SURGERY ON 08/17/2004. DISCOVERED THAT WE HAD FAILED TO SUBMIT A 7000 FORM WHEN EE RETURNED TO WORK ON 10/25/2004.