Updated World Health Organization estimates are showing a downward trend in the incidence of gout in North America among 65-year-olds, but men in that age group on the continent are far more likely to suffer from gout than are men in Africa.
That’s a sampling of the updated data on a host of musculoskeletal disorders worldwide, including rheumatoid arthritis, said Dr. Lyn March at the Annual European Congress of Rheumatology.
Dr. Lyn March
She presented a preliminary report from the Musculoskeletal Expert Group that’s part of the new Global Burden of Diseases, Injuries, and Risk Factors Study, which began in the spring of 2007. This is the first major effort since the original Global Burden of Disease in 1990 study to carry out a complete systematic assessment of the data on all diseases and injuries, and to produce comprehensive and comparable estimates of the burden of diseases, injuries, and risk factors for two time periods (1990 and 2005), according to the WHO. The project is due to produce final estimates in the spring, said Dr. March of the Royal North Shore Hospital in Sydney.
Dr. March said the specific aims for the Musculoskeletal Expert Group are to include more population-based self-report data; to develop health-state descriptions for different levels of severity of osteoarthritis, rheumatoid arthritis, back pain, neck pain, gout, and other musculoskeletal disorders; and to update systematic literature reviews of incidence, prevalence, and mortality risk for these conditions. The group will also evaluate bone mineral density (g/cm2) as a risk factor for disability-adjusted life-year (DALY) burden, "which will put the [degenerative] bone condition on the map for policy making," she said.
"The methodology employed in the systematic review, development of lay health state descriptions, and generation of data estimates for calculating [DALYs] will be revealed," Dr. March said.
In 2000, the beginning of what the WHO declared "the Bone and Joint Decade," results from the previous Global Burden of Disease (GBD) study reported that rheumatoid arthritis accounted for 0.3% of global DALYs (a time-based measure that combined years of life lost to premature mortality and years of life lost to time lived in health states of less-than-ideal health). "These data enable, in part, an evaluation of the impact of the Bone and Joint Decade and the setting of the research agenda for the next decade," Dr. March said.
The GBD study investigated the incidence of 109 diseases and injuries and 10 risk factors across eight World Bank regions. In 2000, the WHO reported that osteoarthritis accounted for 1.1% of global DALYs, ranking 19th among all diseases and disorders, and rheumatoid arthritis accounted for 0.3% of DALYs. All musculoskeletal disorders combined had a prevalence of 2.1% of the worldwide population and ranked 12th in DALYs among all disorders, according to Dr. March. Preliminary data from the 2005 study show trends toward increases in the prevalence of osteoarthritis of the knee and hip, rheumatoid arthritis, and other musculoskeletal disease, and slight decreases in low-back pain and gout, she said, noting that the findings will likely have policy implications.
A 2005 update reported that musculoskeletal disorders are more common in developed countries.
Dr. March had no disclosures to report. The study received funding from the Bill and Melinda Gates Foundation and the Australian Commonwealth Government’s Department of Health and Aging.