Operator was on walkway at creek pump to clean screen. the walkway frame broke & the operator grabbed the railing to keep from falling. At that point he felt a pull in his rt. shoulder. He did not see dr until 3-3-05 & has not lost time. Amendment: After 6 months the dr determined that surgery was reqd to repair a torn ligament. This was not reportable till he reqd surgery 10/13/05