期刊
JOURNAL OF BONE AND MINERAL RESEARCH
卷 28, 期 5, 页码 1029-1040出版社
WILEY
DOI: 10.1002/jbmr.1841
关键词
PRIMARY HYPERPARATHYROIDISM; HIGH-RESOLUTION PERIPHERAL QUANTITATIVE COMPUTED TOMOGRAPHY; INDIVIDUAL TRABECULA SEGMENTATION; FINITE ELEMENT ANALYSIS; FRACTURE RISK
资金
- NIH [DK32333, UL1 RR024156, K24 AR052665, AR 055068, AR058004, AR051376, K23 DK 084337, K23 DK 095944]
- Brazilian National Council of Technological and Scientific Development - CNPq
Typically, in the milder form of primary hyperparathyroidism (PHPT), now seen in most countries, bone density by dual-energy X-ray absorptiometry (DXA) and detailed analyses of iliac crest bone biopsies by histomorphometry and microcomputed tomography (mu CT) show detrimental effects in cortical bone, whereas the trabecular site (lumbar spine by DXA) and the trabecular compartment (by bone biopsy) appear to be relatively well preserved. Despite these findings, fracture risk at both vertebral and nonvertebral sites is increased in PHPT. Emerging technologies, such as high-resolution peripheral quantitative computed tomography (HRpQCT), may provide additional insight into microstructural features at sites such as the forearm and tibia that have heretofore not been easily accessible. Using HRpQCT, we determined cortical and trabecular microstructure at the radius and tibia in 51 postmenopausal women with PHPT and 120 controls. Individual trabecula segmentation (ITS) and microfinite element (mu FE) analyses of the HRpQCT images were also performed to further understand how the abnormalities seen by HRpQCT might translate into effects on bone strength. Women with PHPT showed, at both sites, decreased volumetric densities at trabecular and cortical compartments, thinner cortices, and more widely spaced and heterogeneously distributed trabeculae. At the radius, trabeculae were thinner and fewer in PHPT. The radius was affected to a greater extent in the trabecular compartment than the tibia. ITS analyses revealed, at both sites, that plate-like trabeculae were depleted, with a resultant reduction in the plate/rod ratio. Microarchitectural abnormalities were evident by decreased plate-rod and plate-plate junctions at the radius and tibia, and rod-rod junctions at the radius. These trabecular and cortical abnormalities resulted in decreased whole-bone stiffness and trabecular stiffness. These results provide evidence that in PHPT, microstructural abnormalities are pervasive and not limited to the cortical compartment, which may help to account for increased global fracture risk in PHPT. (c) 2013 American Society for Bone and Mineral Research.
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