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Site of bone density measurement may affect therapy decision
K Lai1, M Rencken, B L Drinkwater
1Osteoporosis Research Center, University of Washington Medical Center, Seattle 98195.
Calcified Tissue International
|October 1, 1993
Summary
Bone mineral density (BMD) measurements at the lumbar spine and femoral neck are not comparable for women deciding on hormone replacement therapy. Both sites are crucial for accurate osteoporosis risk assessment in postmenopausal women.
Area of Science:
- Osteoporosis research
- Menopause studies
- Bone health assessment
Background:
- Bone mineral density (BMD) is critical for assessing osteoporosis risk.
- Hormone replacement therapy (HRT) decisions in perimenopausal women require accurate risk stratification.
- Dual-energy X-ray absorptiometry (DXA) is a standard method for BMD measurement.
Purpose of the Study:
- To compare lumbar spine and femoral neck BMD measurements.
- To evaluate the utility of each site for HRT decision-making in women nearing menopause.
- To determine if single-site BMD measurement adequately identifies osteoporosis risk.
Main Methods:
- Eighty-eight healthy Caucasian women (aged 44-59, 0-5 years post-menopause) participated.
- BMD measured at lumbar spine (L1-L4) and femoral neck using DXA.
- National Osteoporosis Foundation criteria used for risk categorization (≥1 SD below young adult mean = at risk).
Main Results:
- Lumbar spine BMD alone classified 46 women as low risk.
- Femoral neck BMD reclassified 28 of these 46 women as at risk.
- 61% of women deemed low risk by spinal BMD were at risk based on femoral neck BMD.
Conclusions:
- Lumbar spine and femoral neck BMD measurements provide different risk information.
- Both lumbar spine and proximal femur BMD assessments are necessary for accurate osteoporosis risk evaluation.
- Comprehensive BMD assessment aids women in HRT decisions for postmenopausal health.