Lead Levels and Knee Osteoarthritis
Author Information
Author(s): Amanda E Nelson, Xiaoyan A Shi, Todd A Schwartz, Jiu-Chiuan Chen, Jordan B Renner, Kathleen L Caldwell, Charles G Helmick, Joanne M Jordan
Primary Institution: Thurston Arthritis Research Center, University of North Carolina
Hypothesis
Are whole blood lead levels associated with radiographic and symptomatic knee osteoarthritis?
Conclusion
Higher blood lead levels are linked to increased prevalence and severity of knee osteoarthritis.
Supporting Evidence
- For every 1-U increase in ln Pb, the odds of prevalent knee rOA were 20% higher.
- The odds of more severe rOA were 26% higher for each 1-U increase in ln Pb.
- The odds of bilateral rOA were 32% higher for each 1-U increase in ln Pb.
- The odds of having sxOA were 16% higher for each 1-U increase in ln Pb.
- The odds of having more severe sxOA were 17% higher for each 1-U increase in ln Pb.
- The odds of having bilateral sxOA increased by 25% for each 1-U increase in ln Pb.
Takeaway
This study found that higher levels of lead in the blood might make knee arthritis worse.
Methodology
Cross-sectional analysis using data from the Johnston County Osteoarthritis Project, assessing blood lead levels and knee osteoarthritis through radiography and symptom questionnaires.
Potential Biases
Potential biases related to demographic factors affecting blood lead levels.
Limitations
The study's cross-sectional design limits causal conclusions, and blood lead levels may not reflect long-term exposure.
Participant Demographics
Mean age 65.4 years, 66.6% women, 35.4% African-Americans.
Statistical Information
P-Value
0.1
Confidence Interval
95% CI, 1.01 to 1.44
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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