LOOSE CLINKER WAS SPILLING OVER BELT IN #2 FINISH TUNNEL. EE WAS PULLING SUPER SUCKER HOSE (8"" PLASTIC) DOWN TUNNEL TO CLEAN LOOSE CLINKER WHEN HE SLIPPED, TWISTING HIS LEFT KNEE AND FALLING ON HIS RIGHT. LOOSE CLINKER ON FLOOR CONTRIBUTING FACTOR. EE SAW DOCTOR ON 4/4/05 AND RECEIVED PRESCRIPTION FOR SWELLING.