EE WAS USING A PRY BAR TO REMOVE DEBRIS FROM SK VALVE. BAR SLIPPED, CAUSING EE'S RIGHT KNEE TO STRIKE FK PIPE. NOTE: AT TIME THSI WAS CONSIDERED A FIRST AID INCIDENT, IN FACT EE PALYED RAQUET BALL THAT EVENING. WE QUESTION VALIDITY, BUT ARE REPORTING SINCE SURGERY IS REQUIRED.