Vertebral bone density by quantitative computed tomography mirrors bone structure histomorphometric parameters in
Aluizio Barbosa Carvalho1, Ricardo Carneiro, Graziella M Leme
1Nephrology Division, Federal University of São Paulo, Rua Borges Lagoa, 960, São Paulo, SP, 04038-002, Brazil, aluizio@uol.com.br.
Diagnosing low bone mass is of clinical importance for hemodialysis (HD) patients due to its association with fractures and cardiovascular disease. We investigated whether bone density obtained by quantitative computed tomography (QCT) is associated with the histologically determined bone volume and microarchitecture parameters in HD patients. Twenty-six HD patients were studied. Bone biopsy samples were obtained from the iliac crest and trabecular bone volume, thickness, number and separation were evaluated by histomorphometry. Vertebral trabecular bone density (VTBD) was evaluated by QCT. VTBD correlated positively with trabecular bone volume (r = 0.69, p < 0.001), trabecular thickness (r = 0.45, p = 0.022) and trabecular number (r = 0.62, p < 0.001), and negatively with trabecular separation (r = -0.50, p < 0.01). In the multiple linear regression analysis adjusting for age, gender and diabetes, VTBD remained associated with bone volume by histomorphometry (β = 0.06; 95 % CI 0.02-0.11; p = 0.006; R² = 0.49). VTBD measured by QCT mirrored bone volume and microarchitecture parameters obtained by histomorphometry in HD patients.
Diagnosing low bone mass is of clinical importance for hemodialysis (HD) patients due to its association with fractures and cardiovascular disease. We investigated whether bone density obtained by quantitative computed tomography (QCT) is associated with the histologically determined bone volume and microarchitecture parameters in HD patients. Twenty-six HD patients were studied. Bone biopsy samples were obtained from the iliac crest and trabecular bone volume, thickness, number and separation were evaluated by histomorphometry. Vertebral trabecular bone density (VTBD) was evaluated by QCT. VTBD correlated positively with trabecular bone volume (r = 0.69, p < 0.001), trabecular thickness (r = 0.45, p = 0.022) and trabecular number (r = 0.62, p < 0.001), and negatively with trabecular separation (r = -0.50, p < 0.01). In the multiple linear regression analysis adjusting for age, gender and diabetes, VTBD remained associated with bone volume by histomorphometry (β = 0.06; 95 % CI 0.02-0.11; p = 0.006; R² = 0.49). VTBD measured by QCT mirrored bone volume and microarchitecture parameters obtained by histomorphometry in HD patients.
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