Employee is a raw coal dozer operator who was helping the welder this day. He bent over to pick up a chain fall & experienced pain in his lower abdomen. He completed the day & began his 4 days off (works 4 on & 4 off). Saw the Dr. on 4/25/06, had surgery on his left side 5/23/06 & on his rt. side 7/24/06. We learned of LTA 8/15/06 when Supt. called to ask the employee.