EE PRESSURE WASHING DECK ON ROCKY FORD DREDGE, SLIPPED AND TWISTED RIGHT KNEE. EE RECEIVED MEDICAL CARE, PLACED ON RESTRICTED DUTY BUT RETURNED TO FULL DUTY AT HIS REQUEST AFTER 1 WEEK. EE OPT ED TO HAVE RIGHT KNEE SURGERY ON SEPTEMBER 29, 2003. WORK COMP CARRIER, EMPLOYEE FAILED TO COMMUNICATE ONGOING MEDICAL STATUS TO COMPANY. EE WILL MISS WORK FOR UNDETERMINED PERIOD.