EE WAS ASSISTING ROTATING A PIECE OF MACHINERY BY USING A WIRE ROPE AND A SNATCH BLOCK. THE WIRE CHOKER HOLDING THE SNATCH BLOCK IN PLACE FAILED AND THE PULLEY ASSEMBLY STUCK THE EE'S UPPER RT. THIGH AREA. EE WAS EXAMINED AT LOCAL E.R. THAT DAY AND DIAGNOSED WITH A DEEP CONTUSION & RELEASED TO WORK. EE CONTINUED TO WORK REG.DUTIES NEXT FEW MONTHS. PAIN CONTINUED ISSUED MEDS.