Silent Spine Fractures Strike Thai Women Before 65, Screening Study Warns

Osteoporosis has long been portrayed as a disease of old age, a slow thinning of bone that becomes dangerous only in a woman’s seventies or eighties. A new study from Thailand challenges that comfortable assumption. Researchers at King Chulalongkorn Memorial Hospital in Bangkok found that among postmenopausal women under 70, 14.4 percent had vertebral osteoporosis, and a striking 60 percent of those cases occurred in women younger than 65. The findings, published in Archives of Osteoporosis, suggest that screening programs keyed to older age thresholds may be missing a large share of the women most likely to suffer the most feared consequence of the disease: a fractured spine.

The cross-sectional study enrolled 730 postmenopausal women aged 50 to 70 who attended the hospital’s menopause clinic between May 2024 and March 2025. Of these, 721 completed bone mineral density assessments using dual-energy X-ray absorptiometry, or DXA, the technique widely regarded as the clinical gold standard for quantifying bone strength. Rather than relying on reference data drawn from Western populations, the team diagnosed osteoporosis against Asian reference data, a methodological choice that matters enormously, because bone mineral density varies systematically across ethnic groups and using inappropriately high reference values can inflate or deflate prevalence estimates.

DXA works by passing X-ray beams at two different energy levels through the body and measuring how much radiation each absorbs. Because bone absorbs X-rays more strongly than soft tissue, the differential attenuation allows precise calculation of the mineral content per unit area of bone, typically reported in grams per square centimeter at the lumbar spine and hip. Under the World Health Organization’s diagnostic framework, a T-score of minus 2.5 or below, meaning bone density at least two and a half standard deviations below the young adult average, establishes an osteoporosis diagnosis. The Thai investigators applied this threshold using ethnic-appropriate standards, which previous Thai research has shown to be essential for accurate diagnosis in local populations.

Beyond measuring density, the team performed vertebral fracture assessment, or VFA, in women aged 60 to 70. VFA is a clever adaptation of DXA hardware: it produces a lateral image of the thoracic and lumbar spine at a fraction of the radiation dose of conventional spinal radiographs. The technique allows clinicians to identify vertebral deformities, compression fractures that often occur silently, without any pain or height loss dramatic enough to prompt a doctor’s visit. The results were sobering. Asymptomatic vertebral fractures were detected in 4.4 percent of the women scanned, meaning roughly one in twenty-three women in their sixties carried a broken vertebra without knowing it.

This silent burden is precisely why vertebral osteoporosis deserves special attention. Osteoporosis at any skeletal site was found in 19.1 percent of the study population, nearly one woman in five, but the spine is where the disease does its most insidious damage. Vertebral compression fractures are the most common osteoporotic fracture worldwide, yet international studies, including the IMPACT study cited by the researchers, have documented that the majority of vertebral fractures go undiagnosed even in well-resourced health systems. Each existing vertebral fracture independently multiplies the risk of subsequent fractures, creating a cascade in which one silent break sets the stage for the next. Identifying these fractures early is therefore not merely diagnostic bookkeeping; it changes clinical management, triggering pharmacological treatment that can dramatically reduce the risk of further breaks.

The age pattern uncovered in the study is its most consequential finding. Prevalence of both vertebral osteoporosis and osteoporosis at any site increased steadily with age and with the number of years since menopause, exactly as the biology of bone loss predicts. Estrogen is a powerful guardian of skeletal integrity, suppressing the rate of bone resorption by osteoclasts, the cells that dismantle bone tissue. When ovarian estrogen production ceases at menopause, resorption accelerates sharply, outpacing the bone-building work of osteoclasts’ counterparts, the osteoblasts. Longitudinal research, including the multiethnic Study of Women’s Health Across the Nation, has documented that the fastest phase of lumbar spine bone loss occurs in the years immediately surrounding the final menstrual period, and that the pace of this midlife loss predicts later fracture independently of starting bone density.

That physiology explains why so many Thai women in the study were affected before 65. If the steepest decline in spinal bone density happens in the late forties and fifties, then a decade of unchecked loss can push a woman below the osteoporosis threshold well before traditional screening ages arrive. Many countries, including the United States in its 2025 preventive services guidance, recommend osteoporosis screening for women starting at 65, with earlier screening reserved for those with elevated risk factors. The Thai data suggest that such age-based thresholds, calibrated largely to Western populations, may systematically underestimate risk in Asian populations, where peak bone mass tends to be lower and body size smaller, both factors that reduce the skeletal reserve available to absorb postmenopausal loss.

Thailand’s demographic trajectory amplifies the urgency. The country is transitioning rapidly into an aged society, with a growing proportion of its population over 60 and documented geographic and socioeconomic disparities in healthy aging across its provinces. Hip fractures, the most catastrophic manifestation of osteoporosis, impose enormous costs on patients, families, and health systems, and survivors face elevated mortality in the year following the break. Preventing the first fracture is far more effective than managing the aftermath, and prevention depends on finding at-risk women before bone loss reaches the fracture threshold. The new prevalence figures give Thai policymakers a current, locally grounded baseline for deciding when screening should begin and how resources should be distributed.

The study’s clinical setting is worth noting when interpreting its numbers. Because participants were recruited from a menopause clinic, the sample may not perfectly represent all Thai postmenopausal women, some of whom never attend such clinics. Nevertheless, the large sample size of more than 700 women, the use of ethnic-appropriate reference data, and the inclusion of vertebral fracture assessment make this one of the most detailed recent portraits of skeletal health in Thai women of this age group. The work builds on earlier Thai studies from 2001 and subsequent years that documented osteopenia and osteoporosis prevalence and highlighted the importance of ethnic-based standard references for diagnosis, and it extends that lineage with modern imaging and a focus on the under-65 window.

The message for women and their physicians is straightforward: menopause itself, not a birthday decades later, marks the beginning of the period of greatest skeletal vulnerability. Women who went through menopause early, who are thin, who smoke, or who have a family history of fragility fractures should discuss bone health with their doctors well before traditional screening ages. For health systems, the study argues for revising age-based screening strategies so that the many women who develop vertebral osteoporosis in their late fifties and early sixties are caught while treatment can still prevent the silent fractures that so often announce osteoporosis only after the damage is done. As Thailand ages, the cost of screening too late will only grow.

Subject of Research: Prevalence of vertebral osteoporosis and silent vertebral fractures in Thai postmenopausal women aged 50 to 70

Article Title: Prevalence of vertebral osteoporosis in Thai postmenopausal women under 70

Article References: Orprayoon, N., Kingpetch, K., Wattanachanya, L., Champaiboon, J., Phutrakool, P., Surawong, S., Menorngwa, Y., Ittipuripat, S., Sirisalipoch, S., & Chaikittisilpa, S. (2026). Prevalence of vertebral osteoporosis in Thai postmenopausal women under 70. Archives of Osteoporosis, 21(1), Article 141. https://doi.org/10.1007/s11657-026-01775-w

Image Credits: AI Generated

DOI: 10.1007/s11657-026-01775-w

Keywords: osteoporosis, vertebral fractures, postmenopausal women, bone mineral density, DXA, vertebral fracture assessment, menopause, screening, Thailand, aging population, bone health, epidemiology