The number of procedures reported in 2009 was 17.6% less than 2008 and 34.6% less compared to the peak in 2005. Osteoarthritis is the principal diagnosis for total resurfacing hip replacement (94.6%), followed by developmental dysplasia (2.7%), avascular necrosis (1.8%), rheumatoid arthritis (0.4%) and other inflammatory arthritis (0.4%). Most patients are