Jowsey, J Bone Joint Surg Am 1965 - Quantitative Microradiographic Studies of Normal and Osteoporotic Bone

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Quantitative Microradiographic Studies of Normal and Osteoporotic Bone

Jowsey, Gershon-Cohen, et al.·J Bone Joint Surg Am·1965·363 citations·Cross-sectional study

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Jowsey et al. developed and validated quantitative microradiography as a technique for directly measuring bone formation and resorption in undecalcified human bone sections. The method was then applied to compare normal and osteoporotic bone across multiple skeletal sites. The central question: does osteoporosis result from reduced formation, increased resorption, or both?

Key Findings

Osteoporotic bone shows nearly doubled resorption vs normal (15.7% vs 8.5%, P < 0.001) with statistically identical formation rates (2.5% vs 2.6%, P > 0.7). This directly established osteoporosis as a disease of excess resorption, not failed osteoblast activity.
Microradiographic criteria were validated against two independent gold standards:
- Tetracycline labeling (formation) — r = 0.995, 300 foci
- Yttrium-91 autoradiography (resorption): R = 0.995, 205 areas
These correlations confirmed the method measures exactly what it claims.
After age 50, resorption increases 2-fold between ages 40 and 80 while formation holds steady. The quantitative basis for why bone loss accelerates with aging.
In immobilization, the pattern reverses: formation drops significantly (0.7% vs 2.2%, P < 0.001) with no significant change in resorption. Cushing's syndrome and corticosteroid therapy show the same formation-suppressed pattern. These are the key exceptions where reduced formation, not excess resorption, drives bone loss.
The anterior iliac crest has the highest turnover of any sampled site (1.8× vertebral activity) and correlates well with both femur (r = 0.85) and vertebra (r = 0.73), supporting its adoption as the standard metabolic bone biopsy site.

Board PearlPrimary osteoporosis doubles resorption with normal formation — excess osteoclast activity, not osteoblast failure, is the mechanism.

Quantitative Microradiographic Studies of Normal and Osteoporotic Bone

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|

Quantitative Microradiographic Studies of Normal and Osteoporotic Bone

Jowsey, Gershon-Cohen, et al.·J Bone Joint Surg Am·1965·363 citations·Cross-sectional study

|

Jowsey et al. developed and validated quantitative microradiography as a technique for directly measuring bone formation and resorption in undecalcified human bone sections. The method was then applied to compare normal and osteoporotic bone across multiple skeletal sites. The central question: does osteoporosis result from reduced formation, increased resorption, or both?

Key Findings

Osteoporotic bone shows nearly doubled resorption vs normal (15.7% vs 8.5%, P < 0.001) with statistically identical formation rates (2.5% vs 2.6%, P > 0.7). This directly established osteoporosis as a disease of excess resorption, not failed osteoblast activity.
Microradiographic criteria were validated against two independent gold standards:
- Tetracycline labeling (formation) — r = 0.995, 300 foci
- Yttrium-91 autoradiography (resorption): R = 0.995, 205 areas
These correlations confirmed the method measures exactly what it claims.
After age 50, resorption increases 2-fold between ages 40 and 80 while formation holds steady. The quantitative basis for why bone loss accelerates with aging.
In immobilization, the pattern reverses: formation drops significantly (0.7% vs 2.2%, P < 0.001) with no significant change in resorption. Cushing's syndrome and corticosteroid therapy show the same formation-suppressed pattern. These are the key exceptions where reduced formation, not excess resorption, drives bone loss.
The anterior iliac crest has the highest turnover of any sampled site (1.8× vertebral activity) and correlates well with both femur (r = 0.85) and vertebra (r = 0.73), supporting its adoption as the standard metabolic bone biopsy site.

Board PearlPrimary osteoporosis doubles resorption with normal formation — excess osteoclast activity, not osteoblast failure, is the mechanism.

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