EE WAS MOVING THE #7 ROTARY DRILL WITH THE PENDANT. AS HE WAS WALKING ALONG SIDE OF THE DRILL HE INADVERTENTLY STEPPED ON A ROCK TWISTING HIS LT. ANKLE AND KNEE. THE LT. KNEE INJURY WAS AGGRIVATED ON 8/29/01 WHILE CHANGING OUT A DRILL BIT ON THE #6 DRILL. EE HAD SURGERY 1/28/ 02.