A new study has linked exposure to two common perfluorinated chemicals to higher prevalence of osteoarthritis, particularly in women.
PFCs are used in more than 200 industrial processes and consumer products including certain stain- and water-resistant fabrics, grease-proof paper food containers, personal care products, and other items.
Because of their persistence, PFCs have become ubiquitous contaminants of humans and wildlife.
The study is the first to look at the associations between perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), and osteoarthritis, in a study population representative of the United States.
The researchers analyzed data from six years of the National Health and Nutrition Examination Survey (NHANES, 2003-2008), which enabled them to account for factors such as age, income, and race/ethnicity.
When the researchers looked at men and women separately, they found clear, strong associations for women, but not men. Women in the highest 25 percent of exposure to PFOA had about two times the odds of having osteoarthritis compared to those in the lowest 25 percent of exposure.
Although production and usage of PFOA and PFOS have declined due to safety concerns, human and environmental exposure to these chemicals remains widespread.
Future studies are needed to establish temporality and shed light on possible biological mechanisms, the researchers noted.
Better understanding the health effects of these chemicals and identifying any susceptible subpopulations could help to inform public health policies aimed at reducing exposures or associated health impacts, they added.
Sarah Uhl authored the study along with Yale Professor Michelle L. Bell and Tamarra James-Todd, an epidemiologist at the Harvard Medical School and Brigham and Women's Hospital.
The research was the focus of Uhl's Master's of Environmental Science Program at the Yale School of Forestry and Environmental Studies.
The study was published in Environmental Health Perspectives.