WHILE CLEANING COAL SPILL, LOADER CAUGHT BUCKET ON ROADWAY LIP. THIS FORCED EMPLOYEE FORWARD IN HIS SEAT & HE CONTACTED THE DASH WITH HIS RT. KNEE. THIS CAUSED A CONTUSION/POSSIBLE FRACTURE OF THE RT. KNEE CAP DIAGNOSED ON 5/25/05. EE WAS SUSPENDED PENDING REQUIRED COMPANY POLICY TEST, RESULTING IN TERMINATION PRIOR TO ANY LOST WORK OR RESTRICTIONS.