EE WAS USING A PIPE WRENCH IN THE SHIPPING MAINTENANCE SHOP. HE FELT A ""POP"" IN THE KNUCKLE OF HIS RIGHT MIDDLE FINGER WHEN HE TIGHTENED A FITTING ON A PIECE OF PIPE WITH THE WRENCH. FINGER LA TER SWELLED. INJURY DID NOT BECOME REPORTABLE UNTIL HE SAW AN ORTHOPEDIC SPECIALIST ON 3/7/01 & RECEIVED STERIOD INJECTION OF THE JOINT.