EMPLOYEE WAS CHECKING THE CU & ZN CIRCUITS WHEN SHE STEPPED ONTO THE FLOOR GRATING. THE GRATING GAVE WAY, FALLING INTO THE BASEMENT & THE EE FELL. EMPLOYEE WENT TO THE DR. ON 4/18/05 & HAD A BONE SCAN ON 5/12/05. WEEK OF 5/16/05 WE WERE NOTIFIED THAT EE HAD TWO UNDERLINE FRACTURES OF #4 & #6 RIBS.