EE HAS HISTORY OF DEGENERATIVE JOINT DISEASE OF THE RIGHT KNEE. THAT MAY HAVE RESULTED FROM EXPOSURE AT TRANALTA CENTRALIA MINING LLC ON 4/2/2 THIS EE UNDERWENT SURGERY FOR REPAIR HIS DEGENER ATIVE MED MENISCULE TEAR THAT MAY HAVE BEEN AGGRAVATED ON 1/6/02 WHILE GETTING OFF A FORKLIFT