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?
In 1940, Albright proposed that osteoporosis results from osteoblast failure — a reasonable inference, but one made without any method to actually measure bone formation directly. That hypothesis shaped thinking for two decades.
This paper is why we understand osteoporosis as an uncoupling disease. When you see a postmenopausal patient with vertebral compression fractures and a low bone density, the mechanism is excess osteoclast activity against a backdrop of normal osteoblast function. That mechanistic reframe is what made antiresorptive therapy. Eventually bisphosphonates. A rational treatment target.
The exception matters clinically: when your patient has been on chronic steroids or is bedbound, the mechanism shifts to formation suppression. The bone loss looks similar on DXA, but the biology is different.
Jowsey also established the anterior iliac crest as the standard biopsy site for metabolic bone disease. A practice that persists in modern bone histomorphometry, the direct descendant of the technique described here.
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?
In 1940, Albright proposed that osteoporosis results from osteoblast failure — a reasonable inference, but one made without any method to actually measure bone formation directly. That hypothesis shaped thinking for two decades.
This paper is why we understand osteoporosis as an uncoupling disease. When you see a postmenopausal patient with vertebral compression fractures and a low bone density, the mechanism is excess osteoclast activity against a backdrop of normal osteoblast function. That mechanistic reframe is what made antiresorptive therapy. Eventually bisphosphonates. A rational treatment target.
The exception matters clinically: when your patient has been on chronic steroids or is bedbound, the mechanism shifts to formation suppression. The bone loss looks similar on DXA, but the biology is different.
Jowsey also established the anterior iliac crest as the standard biopsy site for metabolic bone disease. A practice that persists in modern bone histomorphometry, the direct descendant of the technique described here.