Revision of the 1994 World Health Organization T-score definition of osteoporosis for use in older East Asian women and men to reconcile it with their lifetime risk of fragility fracture.
Level 5 - mechanism / opinion, no new human data
Narrative review and statistical modeling proposal without prospective cohort validation
PubMed 37889317 · doi:10.1007/s00256-023-04481-7
What was done
The authors conducted a review and statistical modeling analysis using radiographic osteoporotic vertebral fracture as a surrogate clinical endpoint to propose revised bone mineral density (BMD) T-score diagnostic cutpoints for osteoporosis in East Asian populations (Hong Kong Chinese and Japanese men and women) calibrated to local BMD references and comparative Italian cohort data.
What was found
The conventional WHO T-score threshold of ≤ -2.5 overestimates osteoporosis prevalence in East Asians relative to their lower lifetime fracture risk. Proposed revised cutpoints include: - Hong Kong Chinese women: femoral neck approximately -2.7 (empirically -2.77 corresponded to -2.60 for Italian women), total hip -2.6, and spine -3.7 (empirically -3.75 corresponded to -2.44 for Italian women). - Older Chinese men: femoral neck approximately -2.7, total hip -2.6, and spine -3.2 (femoral neck -2.77 corresponded to spine -3.37). - Japanese women: femoral neck -2.75, total hip -3.0, and spine -3.9 using the local Iki et al. BMD reference.
Why it matters
Applying uniform global T-score cutoffs can lead to substantial overdiagnosis of osteoporosis—especially spinal osteoporosis—in East Asian populations. Population-specific thresholds may align diagnostic criteria more closely with true lifetime fracture risk.
Limits
The abstract does not state the sample sizes or specific demographic details of the underlying cohorts. The recommendations rely on statistical modeling and a single surrogate endpoint (radiographic vertebral fractures) rather than prospective clinical trial validation or comprehensive longitudinal fracture incidence data.
Cited by
- context The diagnostic standards for normal bone density were changed, categorizing millions of people as having osteopenia or osteoporosis.