New Orleans — The number of buttock augmentation procedures performed in the United States increased 533 percent in 2003, rising from 614 procedures performed in 2002 to 3,885 in 2003, according to the American Society for Aesthetic Plastic Surgery (ASAPS). In 2004, there was a 45 percent decrease to 2,141 procedures performed, still well above the number performed in 2002. The ASAPS did not collect data about this procedure before 2002. Thomas Roberts, M.D. expects the desire for this procedure to continue.