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The proportion of trabecular bone in human vertebrae
S Y Nottestad1, J J Baumel, D B Kimmel
1School of Medicine, Creighton University, Omaha, NE 68131.
Summary
Human vertebrae contain less trabecular bone than assumed. Both cortical and trabecular bone are lost equally during spinal osteoporosis development, impacting noninvasive bone measurement interpretations.
Area of Science:
- Orthopedics
- Bone Biology
- Osteoporosis Research
Background:
- Trabecular bone proportion in human vertebrae is not well-established.
- Understanding vertebral bone composition is crucial for interpreting bone density measurements.
- Spinal osteoporosis affects bone structure and strength.
Purpose of the Study:
- To quantify the proportion of trabecular bone in human thoracic and lumbar vertebrae.
- To compare trabecular bone content between sexes and in an osteoporotic spine.
- To assess the implications for noninvasive bone measurement techniques.
Main Methods:
- Anatomical dissection of 32 normal female, 4 normal male, and 1 osteoporotic female cadaver vertebrae.
- Separation of vertebrae into body and arch components, and into trabecular and cortical bone tissues.
- Atomic absorption spectrophotometry to determine calcium content in each tissue type.
Main Results:
- Trabeculae constituted 24.4% of calcium in female vertebrae and 18.8% in male vertebrae (p < 0.001).
- Vertebral bodies averaged 41.8% trabecular bone in females and 33.5% in males; arches averaged 9.7% (females) and 4.9% (males).
- The osteoporotic spine showed a trabecular bone proportion (28.5%) not significantly different from normal females.
Conclusions:
- Human thoraco-lumbar vertebrae have a lower trabecular bone proportion than commonly assumed.
- Cortical and trabecular bone may be lost proportionally during spinal osteoporosis.
- Findings are vital for interpreting noninvasive bone density measurements of the spine.