EE WAS ASSISTING MAINTENANCE WITH CHANGE OUT OF GRATES IN CEMENT CLINKER COOLER. MECHANIC HANDED EE GRATES THROUGH DOORWAY OF COOLER, EE CAUGHT BOOT ON STEP GRATING AND FELL SIDEWAYS ONTO LEFT KNEE, DROPPING GRATES ON RIGHT THIGH & STRAINING BACK. SHE SAW PHYSICIAN FOR THE FIRST TIME ON 10/9/03 & HAS RECEIVED OSTEOPATHIC MANIPULATIVE TREATMENT ON MORE THAN ONE OCCASION.