EE WAS REMOVING WHEEL CHOCKS W/L HAND OUT FROM UNDER L FRONT WHEEL OF TRUCK. AS HE PULLED ROPE & TWISTED CHOCKS FOR REMOVAL, FELT PAIN IN TOP OF L HAND. EE REFUSED MEDICAL TREATMENT ON 3/3/11. DURING HIS SHIFT ON 3/4/11, EE NOTICED SWELLING & TENDERNESS IN HAND & ASKED TO SEE DOCTOR. EE WEARING SPLINT ON L ARM/WRIST MAKING INJURY REPORTABLE ON 3/4/11.