ON OCT.19,2001, EE WAS INSPECTING THE LUBE SYSTEM ON DRE8750 DRAGLINE. EE FELT AND HEARD A POP ON THE INSIDE OF HIS L. KNEE. EE REPORTED THE INCIDENT TO HIS SUPERVISOR SEVERAL HOURS AFTER HIS KNEE BEGAN TO FEEL STIFF. ON NOV.30,2001, EEHAD SURGERY FOR A TORN CARTILAGE IN HIS L. KNEE.