Published: May 13, 2025

By: MedicalToxic.com News Desk

A new study published in Scientific Reports has a shocking update about lead poisoning and bone health: It is not the hips, but the spine, that potentially suffers most.

Led by the internationally renowned toxicologist Dr. Omid Mehrpour, researchers from Iran compared 35 lead-poisoned patients and 35 healthy controls to investigate the effects of lead on bone density. There were no substantial differences between groups when examining the femur bone (the hip). However, scientists did find a significant loss in bone mineral density (BMD) in lumbar vertebrae (L1–L4) among individuals exposed to lead.

“The skeletal system is a long-term reservoir for lead—and it turns out, the spine pays a hidden price,” says Dr. Mehrpour.

Lead Poisoning and Bone Density: Key Findings from New DEXA Study

No differences in overall osteoporosis rates were found between the poisoned and healthy subjects.

There were no significant changes in femur BMD, T, and Z scores for lead-exposed subjects.

Lumbar BMD, T, and Z scores were significantly lower for the lead-poisoned group.

Blood lead concentration (BLCs) among the lead-poisoned cohort was >12 times the BLCs of controls.

The bone loss was measured using a DEXA scan (Dual Energy X-ray Absorptiometry), which suggests interesting site-specific vulnerability.

How Chronic Lead Exposure Affects the Spine: Public Health Implications

This study complicates chronic lead exposure conversations, especially in our adult population. While osteoporosis screening often focuses on hip fracture risk, this research suggests clinicians should pay closer attention to the lumbar spine, especially in at-risk populations.

Who’s at Risk of Lead-Related Bone Loss? Occupational and Environmental Sources

Occupational workers (e.g., battery, smelting, recycling)

Users of contaminated opium or cosmetics

Populations in polluted or industrial regions

“Blood lead levels only tell part of the story,” the authors caution. “Lead accumulates in bones and can leach out over decades, especially in aging adults.”

Study Limitations and Future Research on Lead's Impact on the Lumbar Spine

Although the sample size was small and focused on hospitalized patients, the results are consistent with earlier studies showing spine-specific effects of lead. The authors recommend larger, multicenter studies and x-ray fluorescence assessment of bone lead to a more accurate reflection of long-term exposure.

Toxicologist Recommendations: Screening the Spine for Chronic Lead Exposure

Lead poisoning primarily damages the hormones that generate the central nervous system, blood, kidneys, and spine; do not neglect the spine in patients with chronic exposures. When evaluating a patient with chronic exposures, consider lumbar DEXA scans.