EE WAS ASISTING WITH REPOSITIONING OF A HARVEST CATHODE IN THE CELL CUPBOARD. THE SUSPENSION LOOP ON THE OPPOSITE SIDE FROM THE EE FAILED OR SHIFTED. THIS CAUSED THE CATHODE TO DROP, COMPRESSING THE FIRST 2 FINGERS OF THE EE'S L. HAND BETWEEN THE SUSPENSION LOOP & THE HANGER BAR. GIVEN RESTRICTED DUTY; NEXT MORNING COMPLAINED OF BACK PAIN, RETURNED TO PHYSICIAN.