Tarpley is expected to be out six-to-eight weeks but, because the bone was broken cleanly, UNC head trainer Bill Prentice said no surgery will be required.
Tarpley came off the bench for the U.S. in the three preliminary-round Olympics games, then moved into the starting lineup for the three matches in the single-elimination phase, scoring the first goal in the Americans' 2-1 overtime triumph over Brazil in the final.
Tarpley had eight goals in 24 appearances for the U.S. in 2004.
Tarpley pounced on the rebound and buried it from three yards away for her 13th goal of the year.
Tarpley then got her third goal, the one which broke Hamm's school record for NCAA goals, at 83:33 as White sent a through ball to Tarpley from about 20 yards out and Tarpley ran onto the pass into the box and finished the opportunity past Picarelli to close out the scoring.
LindsayTarpley now has 59 career goals and is tied for 10th place in UNC history with Meredith Florance (1997-2000).