Femoral bone mineral density reflects histologically determined cortical bone volume in hemodialysis patients
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We evaluated the associations between dual energy X-ray absorptiometry (DXA) and histologically determined cancellous and cortical bone volume by controlling for vascular calcifications and demographic variables in hemodialysis (HD) patients. Femoral bone mineral density (f-BMD) was associated with cortical porosity.
Assessment of bone mass in chronic kidney disease patients is of clinical importance because of the association between low bone volume, fractures, and vascular calcifications. DXA is used for noninvasive assessment of bone mass whereby vertebral results reflect mainly cancellous bone and femoral results reflect mainly cortical bone. Bone histology allows direct measurements of cancellous and cortical bone volume. The present study evaluates the association between DXA and histologically determined cancellous and cortical bone volumes in HD patients.
In 38 HD patients, DXA was performed for assessment of bone mass, anterior iliac crest bone biopsies for bone volume, and multislice computed tomography for vascular calcifications.
While lumbar bone mineral density (l-BMD) by DXA was not associated with histologically measured cancellous bone volume, coronary Agatson score showed a borderline statistically significant association (P = 0.055). When controlled for age and dialysis duration, f-BMD by DXA was associated with cortical porosity determined by histology (P = 0.005).
The usefulness of l-BMD for predicting bone volume is limited most probably because of interference by soft tissue calcifications. In contrast, f-BMD shows significant association with cortical porosity.
KeywordsBone biopsy Bone mineral density Bone volume Chronic kidney disease Cortical porosity Vascular calcifications
The following colleagues have participated in the study: Célia Gil, Carlos Oliveira, José Galvão, António Morais Sarmento, Silvia Ribeiro, Jorge Dickson, Berta Carvalho, Ilídio Rodrigues, Jorge Baldaia, and Odete Pereira. This study was supported by grants National Institutes of Health NIH RO1 DK51530 (H.H.M.), by the Kentucky Nephrology Research Trust (M-C.M-F., H.H.M.), by the Dean’s Clinical Research Scholar Program, University of Kentucky, no 1012112710 (J.H.), and by a grant from Genzyme. The authors would like to thank ISNI, Instituto Nefrológico de Investigação, for the assistance in the organization of this study and Ms. Juliana Van Willigen and Richard Wheaton for their technical assistance.
Conflicts of interest
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