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In both radius and tibia, cortical (Ct.) vBMD and Ct. thickness increased or were maintained in patients and decreased in controls (p? http://www.selleckchem.com/PD-1-PD-L1.html observed in tibia. Estimated bone failure load by finite element modeling increased in patients in radius but declined in controls (p? http://www.selleckchem.com/products/Adriamycin.html and estimated strength in radius 1 year after PTX, reversing or attenuating age-related changes observed in controls. ? 2012 American Society for Bone and Mineral Research. Primary hyperparathyroidism (PHPT) is a common calcium metabolic disorder characterized by increased secretion of parathyroid hormone (PTH) and elevated serum calcium levels. Insights into skeletal pathophysiology in PHPT mostly arise from histomorphometric studies of iliac crest bone biopsies. In these studies, increased remodeling caused by increased activation frequency has consistently been found, resulting in expansion of the remodeling space (ie, the amount of bone removed by osteoclasts and not yet replaced by osteoblasts).1�C5 In cancellous bone, the balance between resorption and formation within each remodeling cycle has been found to be null or slightly positive, and thus trabecular bone mass seems to be preserved or even increased.1�C4, 6, 7 In iliac cortical bone, endocortical and intracortical remodeling seem preferentially increased over periosteal remodeling, causing reduced cortical width and/or increased cortical porosity.2, 5, 7�C9 At peripheral sites, alterations of cortical bone geometry have been found consistent with periosteal bone apposition http://www.selleck.cn/products/MK-1775.html and endocortical bone resorption.10�C13 Overall, effects appear detrimental to bone integrity as patients with PHPT have been found to have an increased risk of fracture.14, 15 Whereas areal bone mineral density (aBMD) as assessed by dual-energy X-ray absorptiometry (DXA) increases following successful parathyroidectomy (PTX),16 data regarding effects on other determinants of bone strength such as bone geometry and cancellous bone architecture are scarce. Three studies have compared iliac crest bone architecture using histomorphometry before and after PTX (7 months to 3 years postsurgery) and found that cortical porosity was normalized following the decrease in remodeling activity, whereas cancellous bone volume was unchanged.9, 17, 18 Likewise, in radius, improvements in cortical BMD and geometry have been found after surgical cure.