Osteoclasts Gone Wild

The Story

A wrist scan led to a bone-density test, and the result didn’t fit Stina’s age: her bones were thinner than they should be for a woman not yet forty. The chart wrote it off as early perimenopause and handed her a calcium supplement. It was a reasonable guess and the wrong one. Perimenopause explains bone loss by removing estrogen’s brake on resorption — but Stina still had her estrogen. Something else was driving her osteoclasts.

Remodeling is a balance between building and tearing down, and this page is about the tearing-down cell. Osteoclasts are large cellsThe basic structural and functional units of life. that dissolve bone matrix and release its calcium back into the blood; osteoblasts then refill the cavity with new bone. When the two are matched, density holds steady. The problem is that osteoclasts are exquisitely sensitive to inflammatory signals: IL-1β and IL-6 both drive osteoclast formation and activity, tilting the balance toward resorption. Chronically high cytokines, year after year, are a standing order to break bone down faster than it is rebuilt — which is exactly what an inflammatory disease like FMF does. Stina wasn’t menopausal; her osteoclasts had been working overtime on an inflammatory payroll for decades, and her DEXA was the receipt.

From Stina’s chart: Age ~38 DEXA: bone density low for age. Dx: “early/perimenopausal bone loss.” Plan: calcium and vitamin D. No one asked why a young woman was resorbing bone.