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Abstract
PURPOSE OF REVIEW There have been numerous published reports describing skeletal differences between males and females. The goal of this report is to describe recent findings to help elucidate remaining questions. RECENT FINDINGS It is known that even in youth, there are sex differences in skeletal health. One recent report suggests these differences are evident at 6 years of age. With the availability of newer imaging techniques, specifically HRpQCT and microCT-3D, micro-architectural differences related to sex-differences have been studied. This has highlighted the importance of cortical porosity in describing possible sex differences in fracture risk. We have a better understanding of skeletal microarchitecture that highlights sex differences in both growth and aging that may relate to fracture risk, although more longitudinal studies are needed. Sex differences in microarchitecture, particularly cortical porosity may also be important in understanding any, as of yet unknown, sex differences in fracture reduction with treatment.
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Affiliation(s)
- Jeri W Nieves
- Clinical Research Center, Helen Hayes, Route 9W, West Haverstraw, 10993, USA.
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52
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Pye SR, Ward KA, Cook MJ, Laurent MR, Gielen E, Borghs H, Adams JE, Boonen S, Vanderschueren D, Wu FC, O'Neill TW. Bone turnover predicts change in volumetric bone density and bone geometry at the radius in men. Osteoporos Int 2017; 28:935-944. [PMID: 27815569 PMCID: PMC5306158 DOI: 10.1007/s00198-016-3816-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 10/18/2016] [Indexed: 11/17/2022]
Abstract
UNLABELLED Peripheral quantitative computed tomography scans of the distal and midshaft radius were performed in 514 European men aged 40-79 years at baseline and a median of 4.3 years later. Age-related changes in volumetric bone mineral density (vBMD) and bone geometry were greater in men with higher biochemical markers of bone turnover at baseline. INTRODUCTION This study aimed to determine prospective change in bone density and geometry at the radius in men and examine the influence of bone turnover markers and sex hormones on that change. METHODS Men aged 40-79 years were recruited from population registers in Manchester (UK) and Leuven (Belgium). At baseline, markers of bone formation (P1NP and osteocalcin) and resorption (β-cTX and ICTP) were assessed. Total and bioavailable testosterone and oestradiol were also measured. Peripheral quantitative computed tomography (pQCT) was used to scan the radius at distal and midshaft sites at the baseline assessment and a median of 4.3 years later. RESULTS Five hundred fourteen men, mean (SD) age of 59.6 (10.5) years, contributed to the data. At the midshaft site, there was a significant decrease in mean cortical vBMD (-0.04 %/year), bone mineral content (BMC) (-0.1 %/year) and cortical thickness (-0.4 %/year), while total and medullary area increased (+0.5 and +2.4 %/year respectively). At the distal radius, total vBMD declined (-0.5 %/year) and radial area increased (+0.6 %/year). Greater plasma concentrations of bone resorption and formation markers were associated with greater decline in BMC and cortical area at the midshaft and total vBMD at the distal site. Increased bone resorption was linked with an increase in total and medullary area and decrease in cortical thickness at the midshaft. Sex hormone levels were unrelated to change in pQCT parameters. CONCLUSIONS Age-related changes in vBMD and bone geometry are greater in men with higher biochemical markers of bone turnover at baseline. Sex hormones have little influence on change in pQCT parameters.
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Affiliation(s)
- S R Pye
- Arthritis Research UK Centre for Epidemiology, Division of Musculoskeletal and Dermatological Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Oxford Road, Manchester, M13 9PT, UK
- NIHR Manchester Musculoskeletal Biomedical Research Unit, Central Manchester NHS Foundation Trust, Manchester Academic Health Sciences Centre, Manchester, UK
| | - K A Ward
- MRC Human Nutrition Research, Elsie Widdowson Laboratory, Cambridge, UK
| | - M J Cook
- Arthritis Research UK Centre for Epidemiology, Division of Musculoskeletal and Dermatological Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - M R Laurent
- Gerontology and Geriatrics, Department of Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium
- Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium
| | - E Gielen
- Gerontology and Geriatrics, Department of Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium
- Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium
| | - H Borghs
- Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium
| | - J E Adams
- Radiology and Manchester Academic Health Science Centre, The Royal Infirmary, The University of Manchester, Manchester, UK
| | - S Boonen
- Gerontology and Geriatrics, Department of Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium
- Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium
| | - D Vanderschueren
- Clinical and Experimental Endocrinology, Department of Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium
| | - F C Wu
- Andrology Research Unit, Centre for Endocrinology and Diabetes, University of Manchester, Manchester, UK
| | - T W O'Neill
- Arthritis Research UK Centre for Epidemiology, Division of Musculoskeletal and Dermatological Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Oxford Road, Manchester, M13 9PT, UK. terence.o'
- NIHR Manchester Musculoskeletal Biomedical Research Unit, Central Manchester NHS Foundation Trust, Manchester Academic Health Sciences Centre, Manchester, UK. terence.o'
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53
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Farmer S, Shanbhogue VV, Hansen S, Stahlberg CI, Vestergaard H, Hermann AP, Frederiksen H. Bone mineral density and microarchitecture in patients with essential thrombocythemia and polycythemia vera. Osteoporos Int 2017; 28:677-685. [PMID: 27734102 DOI: 10.1007/s00198-016-3788-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 09/22/2016] [Indexed: 02/07/2023]
Abstract
UNLABELLED In this cross-sectional study of 45 patients with myeloproliferative neoplasms, we found no evidence of secondary osteoporosis. INTRODUCTION Patients with essential thrombocythemia (ET) and polycythaemia vera (PV) are at increased risk of fractures but the underlying mechanisms have not been settled. We conducted a study to assess bone mineral density, microarchitecture, estimated bone strength and global bone turnover in 45 patients with ET or PV. METHODS Patients were evaluated in a cross-sectional study with dual energy X-ray absorptiometry (DXA) at the hip and spine; high-resolution peripheral quantitative computed tomography (HR-pQCT) at the distal radius and distal tibia; and biochemical markers of bone turnover including pro-collagen type 1 N-terminal pro-peptide, osteocalcin, C-terminal cross-linking telopeptide of type 1 collagen and bone-specific alkaline phosphatase. Also, 45 healthy comparisons, matched on age, height and weight with each patient were included as control subjects. RESULTS Patients and comparisons had almost identical BMDs: 0.96 (IQR: 0.85-1.07) g/cm2 and 0.96 g/cm2 (IQR: 0.86-1.05 g/cm2), respectively. As well all microarchitecture and estimated bone strength measures were highly similar in the two groups. Levels of bone turnover markers were within reference values in patients. CONCLUSION These results reveal no evidence of secondary osteoporosis among patients with ET or PV. The mechanism behind the increased fracture risk in ET or PV patients remains unknown.
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Affiliation(s)
- S Farmer
- Department of Haematology, Odense University Hospital, Sdr. Boulevard 29, DK-5000, Odense, Denmark.
| | - V V Shanbhogue
- Department of Endocrinology, Odense University Hospital, Odense, Denmark
| | - S Hansen
- Department of Endocrinology, Odense University Hospital, Odense, Denmark
| | - C I Stahlberg
- Department of Pathology, Odense University Hospital, Odense, Denmark
| | - H Vestergaard
- Department of Haematology, Odense University Hospital, Sdr. Boulevard 29, DK-5000, Odense, Denmark
| | - A P Hermann
- Department of Endocrinology, Odense University Hospital, Odense, Denmark
| | - H Frederiksen
- Department of Haematology, Odense University Hospital, Sdr. Boulevard 29, DK-5000, Odense, Denmark
- Department of Clinical Epidemiology, Aarhus University Hospital, Odense, Denmark
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54
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Lindgren E, Karlsson MK, Lorentzon M, Rosengren BE. Bone Traits Seem to Develop Also During the Third Decade in Life-Normative Cross-Sectional Data on 1083 Men Aged 18-28 Years. J Clin Densitom 2017; 20:32-43. [PMID: 27546559 DOI: 10.1016/j.jocd.2016.07.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 05/03/2016] [Accepted: 07/26/2016] [Indexed: 11/24/2022]
Abstract
By identifying individuals with low peak bone mass (PBM) at young age, early targeted interventions to reduce future fracture risk could be possible. Peripheral quantitative computed tomography (pQCT) is in many ways superior to the gold standard dual-energy X-ray absorptiometry (DXA), as cortical and trabecular compartments as well as the volumetric density and bone structure can be examined separately. Because each of these traits contributes independently to bone strength, it is probable that pQCT provides an even better fracture risk estimation than DXA. Currently, the clinical applications of pQCT are limited partly because comprehensive normative pQCT data, especially in young men, are not readily available. We therefore set up a study in young men with the following objectives: (1) to identify peak ages in pQCT bone traits with special reference to PBM and peak bone strength; and (2) to provide normative pQCT data. We measured volumetric bone mineral density and structural parameters at ultradistal (trabecular bone) and diaphyseal radius and tibia (cortical bone) by pQCT scans (Stratec XCT2000®; Stratec Medizintechnik GmbH, Pforzheim, Germany) in a population-based age-stratified sample of 1083 men aged 18-28 yr residing in greater Malmö, Sweden. Group differences in 1-yr classes were evaluated by analysis of variance. We found similar bone traits in age groups at ultradistal sites whereas most bone traits at diaphyseal sites were higher with higher ages, however with different increment patterns depending on the specific trait. In Swedish young adult men, we found that different bone traits continued to change after age 18, but at different rates, indicating that peak areal bone mineral density (as measured by DXA) and peak bone strength may be reached at different ages.
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Affiliation(s)
- Erik Lindgren
- Clinical and Molecular Osteoporosis Research Unit, Department of Orthopedics and Clinical Sciences, Lund University, Skåne University Hospital, Malmö, Sweden.
| | - Magnus K Karlsson
- Clinical and Molecular Osteoporosis Research Unit, Department of Orthopedics and Clinical Sciences, Lund University, Skåne University Hospital, Malmö, Sweden
| | - Mattias Lorentzon
- Geriatric Medicine, Institute of Medicine, Sahlgrenska University Hospital and Gothenburg University, Gothenburg, Sweden
| | - Bjorn E Rosengren
- Clinical and Molecular Osteoporosis Research Unit, Department of Orthopedics and Clinical Sciences, Lund University, Skåne University Hospital, Malmö, Sweden
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55
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Almeida M, Laurent MR, Dubois V, Claessens F, O'Brien CA, Bouillon R, Vanderschueren D, Manolagas SC. Estrogens and Androgens in Skeletal Physiology and Pathophysiology. Physiol Rev 2017; 97:135-187. [PMID: 27807202 PMCID: PMC5539371 DOI: 10.1152/physrev.00033.2015] [Citation(s) in RCA: 463] [Impact Index Per Article: 66.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Estrogens and androgens influence the growth and maintenance of the mammalian skeleton and are responsible for its sexual dimorphism. Estrogen deficiency at menopause or loss of both estrogens and androgens in elderly men contribute to the development of osteoporosis, one of the most common and impactful metabolic diseases of old age. In the last 20 years, basic and clinical research advances, genetic insights from humans and rodents, and newer imaging technologies have changed considerably the landscape of our understanding of bone biology as well as the relationship between sex steroids and the physiology and pathophysiology of bone metabolism. Together with the appreciation of the side effects of estrogen-related therapies on breast cancer and cardiovascular diseases, these advances have also drastically altered the treatment of osteoporosis. In this article, we provide a comprehensive review of the molecular and cellular mechanisms of action of estrogens and androgens on bone, their influences on skeletal homeostasis during growth and adulthood, the pathogenetic mechanisms of the adverse effects of their deficiency on the female and male skeleton, as well as the role of natural and synthetic estrogenic or androgenic compounds in the pharmacotherapy of osteoporosis. We highlight latest advances on the crosstalk between hormonal and mechanical signals, the relevance of the antioxidant properties of estrogens and androgens, the difference of their cellular targets in different bone envelopes, the role of estrogen deficiency in male osteoporosis, and the contribution of estrogen or androgen deficiency to the monomorphic effects of aging on skeletal involution.
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Affiliation(s)
- Maria Almeida
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Michaël R Laurent
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Vanessa Dubois
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Frank Claessens
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Charles A O'Brien
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Roger Bouillon
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Dirk Vanderschueren
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
| | - Stavros C Manolagas
- Division of Endocrinology and Metabolism, Center for Osteoporosis and Metabolic Bone Diseases, University of Arkansas for Medical Sciences and the Central Arkansas Veterans Healthcare System, Little Rock, Arkansas; Departments of Cellular and Molecular Medicine and Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium; Center for Metabolic Bone Diseases, University Hospitals Leuven, Leuven, Belgium; and Institut National de la Santé et de la Recherche Médicale UMR1011, University of Lille and Institut Pasteur de Lille, Lille, France
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56
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Okazaki N, Burghardt AJ, Chiba K, Schafer AL, Majumdar S. Bone microstructure in men assessed by HR-pQCT: Associations with risk factors and differences between men with normal, low, and osteoporosis-range areal BMD. Bone Rep 2016; 5:312-319. [PMID: 28580402 PMCID: PMC5440848 DOI: 10.1016/j.bonr.2016.10.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 10/12/2016] [Accepted: 10/30/2016] [Indexed: 11/16/2022] Open
Abstract
Purpose The primary objective of this study was to analyze the relationships between bone microstructure and strength, and male osteoporosis risk factors including age, body mass index, serum 25-hydroxyvitamin D level, and testosterone level. A secondary objective was to compare microstructural and strength parameters between men with normal, low, and osteoporosis-range areal bone mineral density (aBMD). Methods Seventy-eight healthy male volunteers (mean age 62.4 ± 7.8 years, range 50–84 years) were recruited. The participants underwent dual-energy X-ray absorptiometry (DXA) and high-resolution peripheral quantitative computed tomography (HR-pQCT) of the ultra-distal radius and tibia. From the HR-pQCT images, volumetric bone mineral density (BMD) and cortical and trabecular bone microstructure were evaluated, and bone strength and cortical load fraction (Ct.LF) were estimated using micro-finite element analysis (μFEA). Results Age was more strongly correlated with bone microstructure than other risk factors. Age had significant positive correlations with cortical porosity at both ultra-distal radius and tibia (r = 0.36, p = 0.001, and r = 0.47, p < 0.001, respectively). At the tibia, age was negatively correlated with cortical BMD, whereas it was positively correlated with trabecular BMD. In μFEA, age was negatively correlated with Ct.LF, although not with bone strength. Compared with men with normal aBMD, men with low or osteoporosis-range aBMD had significantly poor trabecular bone microstructure and lower bone strength at the both sites, while there was no significant difference in cortical bone. Conclusions Cortical bone microstructure was negatively affected by aging, and there was a suggestion that the influence of aging may be particularly important at the weight-bearing sites. Bone microstructure of the ultra-distal radius and tibia was analyzed by HR-pQCT. The subjects consisted of 78 healthy male volunteers ranging from 50 to 84 years. Cortical bone was more impaired with age compared with trabecular bone. Cortical porosity was increased with age, particularly at the ultra-distal tibia.
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Affiliation(s)
- Narihiro Okazaki
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, USA.,Department of Orthopaedic Surgery, Nagasaki University Graduate School of Biomedical Sciences, Japan
| | - Andrew J Burghardt
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, USA
| | - Ko Chiba
- Department of Orthopaedic Surgery, Nagasaki University Graduate School of Biomedical Sciences, Japan
| | - Anne L Schafer
- Medical Service, San Francisco VA Medical Center, USA.,Department of Medicine, University of California, San Francisco, USA.,Department of Epidemiology and Biostatistics, University of California, San Francisco, USA
| | - Sharmila Majumdar
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, USA
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57
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Burt LA, Liang Z, Sajobi TT, Hanley DA, Boyd SK. Sex- and Site-Specific Normative Data Curves for HR-pQCT. J Bone Miner Res 2016; 31:2041-2047. [PMID: 27192388 DOI: 10.1002/jbmr.2873] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 05/05/2016] [Accepted: 05/15/2016] [Indexed: 12/14/2022]
Abstract
The purpose of this study was to develop age-, site-, and sex-specific centile curves for common high-resolution peripheral quantitative computed tomography (HR-pQCT) and finite-element (FE) parameters for males and females older than 16 years. Participants (n = 866) from the Calgary cohort of the Canadian Multicentre Osteoporosis Study (CaMos) between the ages of 16 and 98 years were included in this study. Participants' nondominant radius and left tibia were scanned using HR-pQCT. Standard and automated segmentation methods were performed and FE analysis estimated apparent bone strength. Centile curves were generated for males and females at the tibia and radius using the generalized additive models for location, scale, and shape (GAMLSS) package in R. After GAMLSS analysis, age-, sex-, and site-specific centiles (10th, 25th, 50th, 75th, 90th) for total bone mineral density and trabecular number as well as failure load have been calculated. Clinicians and researchers can use these reference curves as a tool to assess bone health and changes in bone quality. © 2016 American Society for Bone and Mineral Research.
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Affiliation(s)
- Lauren A Burt
- Department of Radiology, Cumming School of Medicine, University of Calgary, Calgary, Canada.,McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Canada
| | - Zhiying Liang
- Department of Community Health Sciences, University of Calgary, Calgary, Canada.,O'Brien Institute for Public Health, University of Calgary, Calgary, Canada
| | - Tolulope T Sajobi
- Department of Community Health Sciences, University of Calgary, Calgary, Canada.,O'Brien Institute for Public Health, University of Calgary, Calgary, Canada
| | - David A Hanley
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Canada.,Department of Community Health Sciences, University of Calgary, Calgary, Canada.,Department of Oncology, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - Steven K Boyd
- Department of Radiology, Cumming School of Medicine, University of Calgary, Calgary, Canada.,McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Canada
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58
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Krøigård AB, Frost M, Larsen MJ, Ousager LB, Frederiksen AL. Bone structure in two adult subjects with impaired minor spliceosome function resulting from RNU4ATAC mutations causing microcephalic osteodysplastic primordial dwarfism type 1 (MOPD1). Bone 2016; 92:145-149. [PMID: 27591150 DOI: 10.1016/j.bone.2016.08.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 08/22/2016] [Accepted: 08/30/2016] [Indexed: 11/18/2022]
Abstract
Microcephalic osteodysplastic primordial dwarfism type 1 (MOPD1), or Taybi-Linder syndrome is characterized by distinctive skeletal dysplasia, severe intrauterine and postnatal growth retardation, microcephaly, dysmorphic features, and neurological malformations. It is an autosomal recessive disorder caused by homozygous or compound heterozygous mutations in the RNU4ATAC gene resulting in impaired function of the minor spliceosome. Here, we present the first report on bone morphology, bone density and bone microstructure in two adult MOPD1 patients and applied radiographs, dual energy X-ray absorptiometry, high-resolution peripheral quantitative computed tomography and biochemical evaluation. The MOPD1 patients presented with short stature, low BMI but normal macroscopic bone configuration. Bone mineral density was low. Compared to Danish reference data, total bone area, cortical bone area, cortical thickness, total bone density, cortical bone density, trabecular bone density and trabecular bone volume per tissue volume (BV/TV) were all low. These findings may correlate to the short stature and low body weight of the MOPD1 patients. Our findings suggest that minor spliceosome malfunction may be associated with altered bone modelling.
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Affiliation(s)
| | - Morten Frost
- Dept. of Endocrinology, Odense University Hospital, Odense, Denmark
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59
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Agarwal S, Rosete F, Zhang C, McMahon DJ, Guo XE, Shane E, Nishiyama KK. In vivo assessment of bone structure and estimated bone strength by first- and second-generation HR-pQCT. Osteoporos Int 2016; 27:2955-66. [PMID: 27155883 DOI: 10.1007/s00198-016-3621-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 04/28/2016] [Indexed: 11/26/2022]
Abstract
UNLABELLED Bone strength is dependent on bone density and microstructure. High-resolution peripheral quantitative computed tomography (HR-pQCT) can measure microstructure but is somewhat limited due to its resolution. We compared a new HR-pQCT scanner to existing technology and found very good agreement for most parameters. This study will be important when interpreting results from different devices. INTRODUCTION Recently, a second-generation HR-pQCT scanner (XCT2) has been developed with a higher nominal isotropic resolution (61 μm) compared to the first-generation device (XCT1, 82 μm). It is unclear how in vivo measurements from these two devices compare. In this study, we obtained and analyzed in vivo XCT1 and XCT2 measurements of bone microarchitecture and estimated strength. METHODS We scanned 51 adults (16 men and 35 women, age 44.8 ± 16.0) on both XCT2 and XCT1 on the same day. We first compared XCT1 and XCT2 measurements obtained using their respective standard patient protocols. In XCT1, microarchitecture parameters were derived, while XCT2 measurements were directly measured. We also compared XCT2-D with XCT1 by finding the overlapping regions of interest and using the standard patient protocol for XCT1. RESULTS We obtained excellent agreement between XCT1 and XCT2 for most of the volumetric bone mineral density (vBMD), trabecular and cortical measurements (All R (2) > 0.820) except for cortical porosity at the radius (R (2) = 0.638), trabecular number (R (2) = 0.694, 0.787) and trabecular thickness (R (2) = 0.569, 0.527) at both radius and tibia, respectively. XCT1 and XCT2-D measurements also had excellent agreement for most of the measurements (all R (2) > 0.870) except trabecular number (R (2) = 0.524, 0.706), trabecular thickness (R (2) = 0.758, 0.734) at both radius and tibia, respectively, and trabecular separation (R (2) = 0.656) at the radius. CONCLUSION While some caution should be exercised for parameters that are more dependent on image resolution, results from our study indicate that second-generation scans can be compared to more widely available first-generation data and may be beneficial for multicenter and longitudinal studies using both scanner generations.
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Affiliation(s)
- S Agarwal
- Division of Endocrinology, Department of Medicine, Columbia University, New York, NY, USA
| | - F Rosete
- Division of Endocrinology, Department of Medicine, Columbia University, New York, NY, USA
| | - C Zhang
- Division of Endocrinology, Department of Medicine, Columbia University, New York, NY, USA
| | - D J McMahon
- Division of Endocrinology, Department of Medicine, Columbia University, New York, NY, USA
| | - X E Guo
- Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - E Shane
- Division of Endocrinology, Department of Medicine, Columbia University, New York, NY, USA
| | - K K Nishiyama
- Division of Endocrinology, Department of Medicine, Columbia University, New York, NY, USA.
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60
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Frederiksen AL, Duno M, Johnsen IBG, Nielsen MF, Krøigård AB. Asymptomatic parental mosaicism for osteogenesis imperfecta associated with a new splice site mutation in COL1A2. Clin Case Rep 2016; 4:972-978. [PMID: 27761249 PMCID: PMC5054473 DOI: 10.1002/ccr3.658] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 05/26/2016] [Accepted: 07/11/2016] [Indexed: 12/05/2022] Open
Abstract
Recurrent lethal perinatal osteogenesis imperfecta may result from asymptomatic parental mosaicism. A previously unreported mutation in COL1A2 leads to recurrent cases of fetal osteogenesis imperfecta Sillence type IIA, which emphasizes the importance of clinical and genetic evaluation of mosaicism in asymptomatic parents as verified mosaicism highly increases recurrence risk.
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Affiliation(s)
- Anja Lisbeth Frederiksen
- Department of Clinical Genetics Odense University Hospital Odense Denmark; Department of Clinical Research, Faculty of Health University of Southern Denmark
| | - Morten Duno
- Department of Clinical Genetics University Hospital Copenhagen Copenhagen Denmark
| | - Iben B G Johnsen
- Department of Clinical Pathology Odense University Hospital Odense Denmark
| | | | - Anne Bruun Krøigård
- Department of Clinical Genetics Odense University Hospital Odense Denmark; Department of Clinical Pathology Odense University Hospital Odense Denmark
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61
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Shanbhogue VV, Brixen K, Hansen S. Age- and Sex-Related Changes in Bone Microarchitecture and Estimated Strength: A Three-Year Prospective Study Using HRpQCT. J Bone Miner Res 2016; 31:1541-9. [PMID: 26896351 DOI: 10.1002/jbmr.2817] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 02/12/2016] [Accepted: 02/15/2016] [Indexed: 11/08/2022]
Abstract
Although projections from cross-sectional studies have shown that bone loss leading to osteoporosis begins around menopause in women and later in life in men, this has not been examined longitudinally in population-based studies using high-resolution technology capable of distinguishing cortical (Ct) and trabecular (Tb) bone microarchitecture. The aim of this 3-year prospective study was to investigate age- and sex-related changes in bone compartment-specific geometry, volumetric bone mineral density (vBMD), microarchitecture, and estimated strength. The distal radius and tibia were imaged at baseline and after 3 years (median 3.0; range, 2.7 to 3.9 years) using high-resolution peripheral computed tomography (HRpCT) in an age- and sex-stratified, population-based, random sample of white men and women (n = 260) aged 21 to 82 years. In general, at the radius and tibia there was a moderate annual increase in cortical thickness (Ct.Th) that seemed to offset the increase in cortical porosity (Ct.Po), resulting in net annual increase in cortical vBMD (Ct.vBMD) in premenopausal women and young men. With advancing age, postmenopausal women displayed significant bone loss with decreased trabecular vBMD (Tb.vBMD) (due to loss of entire trabeculae) and Ct.vBMD (manifested as increase in Ct.Po and decrease in Ct.Th) at the radius, and a decline in Ct.vBMD (with increasing Ct.Po) at the tibia, resulting in loss of estimated bone strength. In contrast, men had a lower rate of bone loss with advancing age with smaller increases in Ct.Po at both the skeletal sites. In summary, the pattern of bone loss in men and women was discrepant, with women losing more bone than men with aging, although with a dominance of cortical over trabecular bone loss at the peripheral sites in both sexes. This conforms to epidemiological evidence that most fractures occurring in old age are predominantly at cortical peripheral sites, with women having a higher incidence of fractures than men at any given age. © 2016 American Society for Bone and Mineral Research.
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Affiliation(s)
- Vikram V Shanbhogue
- Department of Endocrinology, Odense University Hospital, Odense, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Kim Brixen
- Department of Endocrinology, Odense University Hospital, Odense, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Stinus Hansen
- Department of Endocrinology, Odense University Hospital, Odense, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
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62
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Curtis EM, van der Velde R, Moon RJ, van den Bergh JPW, Geusens P, de Vries F, van Staa TP, Cooper C, Harvey NC. Epidemiology of fractures in the United Kingdom 1988-2012: Variation with age, sex, geography, ethnicity and socioeconomic status. Bone 2016; 87:19-26. [PMID: 26968752 PMCID: PMC4890652 DOI: 10.1016/j.bone.2016.03.006] [Citation(s) in RCA: 255] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 02/09/2016] [Accepted: 03/07/2016] [Indexed: 12/18/2022]
Abstract
UNLABELLED Rates of fracture worldwide are changing. Using the Clinical Practice Research Datalink (CPRD), age, and gender, geographical, ethnic and socioeconomic trends in fracture rates across the United Kingdom were studied over a 24-year period 1988-2012. Previously observed patterns in fracture incidence by age and fracture site were evident. New data on the influence of geographic location, ethnic group and socioeconomic status were obtained. INTRODUCTION With secular changes in age- and sex-specific fracture incidence observed in many populations, and global shifts towards an elderly demography, it is vital for health care planners to have an accurate understanding of fracture incidence nationally. We aimed to present up to date fracture incidence data in the UK, stratified by age, sex, geographic location, ethnicity and socioeconomic status. METHODS The Clinical Practice Research Datalink (CPRD) contains anonymised electronic health records for approximately 6.9% of the UK population. Information comes from General Practitioners, and covers 11.3 million people from 674 practices across the UK, demonstrated to be representative of the national population. The study population consisted of all permanently registered individuals aged ≥18years. Validated data on fracture incidence were obtained from their medical records, as was information on socioeconomic deprivation, ethnicity and geographic location. Age- and sex-specific fracture incidence rates were calculated. RESULTS Fracture incidence rates by age and sex were comparable to those documented in previous studies and demonstrated a bimodal distribution. Substantial geographic heterogeneity in age- and sex adjusted fracture incidence was observed, with rates in Scotland almost 50% greater than those in London and South East England. Lowest rates of fracture were observed in black individuals of both sexes; rates of fragility fracture in white women were 4.7 times greater than in black women. Strong associations between deprivation and fracture risk were observed in hip fracture in men, with a relative risk of 1.3 (95% CI 1.21-1.41) in Index of Multiple Deprivation category 5 (representing the most deprived) compared to category 1. CONCLUSIONS This study presents robust estimates of fracture incidence across the UK, which will aid decisions regarding allocation of healthcare provision to populations of greatest need. It will also assist the implementation and design of strategies to reduce fracture incidence and its personal and financial impact on individuals and health services.
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Affiliation(s)
- Elizabeth M Curtis
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, SO16 6YD, UK
- Correspondence and reprint requests to: Professor Cyrus Cooper, MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK. Tel: +44 (0) 23 8077 7624 Fax: +44 (0) 23 8070 4021,
| | - Robert van der Velde
- Dept of Internal Medicine, VieCuri Medical Center, Venloseweg 595971 PB Venlo, the Netherlands
| | - Rebecca J Moon
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, SO16 6YD, UK
- Paediatric Endocrinology, Southampton University Hospitals NHS Foundation Trust, Southampton, SO16 6YD, UK
| | - Joop P W van den Bergh
- Dept of Internal Medicine, VieCuri Medical Center, Venloseweg 595971 PB Venlo, the Netherlands
- Maastricht University Medical Center, Maastricht, The Netherlands
| | - Piet Geusens
- Department of Internal Medicine, Subdivision of Rheumatology, Maastricht University Medical Centre, Maastricht, The Netherlands
- University Hasselt, Hasselt, Belgium
| | - Frank de Vries
- Department of Clinical Pharmacy & Toxicology, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Tjeerd P van Staa
- Health eResearch Centre, Farr Institute for Health Informatics Research, University of Manchester, 1.003 Vaughan House, Portsmouth Road, M13 9PL, UK
- Department of Pharmacoepidemiology & Clinical Pharmacology, University of Utrecht, Utrecht, the Netherlands, 3508 TB
| | - Cyrus Cooper
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, SO16 6YD, UK
- NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Tremona Road, Southampton, SO16 6YD, UK
- NIHR Musculoskeletal Biomedical Research Unit, University of Oxford, Nuffield Orthopedic Centre, Headington, Oxford, OX3 7HE, UK
| | - Nicholas C Harvey
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, SO16 6YD, UK
- NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Tremona Road, Southampton, SO16 6YD, UK
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63
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Starup-Linde J, Lykkeboe S, Gregersen S, Hauge EM, Langdahl BL, Handberg A, Vestergaard P. Bone Structure and Predictors of Fracture in Type 1 and Type 2 Diabetes. J Clin Endocrinol Metab 2016; 101:928-36. [PMID: 26756117 DOI: 10.1210/jc.2015-3882] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
CONTEXT Type 1 and type 2 diabetes mellitus are associated with an increased risk of fracture. OBJECTIVE The objective of the study was to compare the bone structure and density between type 1 and type 2 diabetes patients and to investigate fracture associations. DESIGN This was a cross-sectional study. SETTING AND PATIENTS Physician-diagnosed type 1 and type 2 diabetes patients were included from the outpatient clinics at two university hospitals participated in the study. MAIN OUTCOME MEASURES Bone density and structure were assessed by dual-energy x-ray absorptiometry and high-resolution peripheral quantitative computed tomography. Blood samples were collected for bone turnover markers. Prevalent vertebral fractures were assessed by vertebral fracture assessment and x-ray, and incident fractures were collected from The Danish National Hospital Discharge Register. RESULTS Bone mineral density (BMD) was higher in type 2 than type 1 diabetes patients at the hip, femur, and spine; however, only the hip differed in multivariate-adjusted models. Bone tissue stiffness at the tibia was increased in type 2 diabetes patients also in adjusted models. Sclerostin levels were inversely associated with fracture in type 1 diabetes patients. The patients with the highest tertile of sclerostin had an 81% decreased risk of a fracture compared with the lowest tertile. CONCLUSIONS Type 1 and type 2 diabetes patients differ in BMD of the hip and tissue stiffness at the tibia. Sclerostin may be a marker independent of BMD to predict fractures in type 1 diabetes patients and thus potentially of clinical importance. Studies with longer follow-up are needed.
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Affiliation(s)
- Jakob Starup-Linde
- Departments of Endocrinology and Internal Medicine (J.S.-L., S.G., L.L.) and Rheumatology (E.-M.H.), Aarhus University Hospital, DK-8000 C Aarhus, Denmark; Department of Clinical Medicine (J.S.-L., A.H., P.V.), Aalborg University, DK-9220 Aalborg, Denmark; Departments of Clinical Biochemistry (S.L., A.H.) and Endocrinology (P.V.), Aalborg University Hospital, DK-9000 Aalborg, Denmark
| | - Simon Lykkeboe
- Departments of Endocrinology and Internal Medicine (J.S.-L., S.G., L.L.) and Rheumatology (E.-M.H.), Aarhus University Hospital, DK-8000 C Aarhus, Denmark; Department of Clinical Medicine (J.S.-L., A.H., P.V.), Aalborg University, DK-9220 Aalborg, Denmark; Departments of Clinical Biochemistry (S.L., A.H.) and Endocrinology (P.V.), Aalborg University Hospital, DK-9000 Aalborg, Denmark
| | - Søren Gregersen
- Departments of Endocrinology and Internal Medicine (J.S.-L., S.G., L.L.) and Rheumatology (E.-M.H.), Aarhus University Hospital, DK-8000 C Aarhus, Denmark; Department of Clinical Medicine (J.S.-L., A.H., P.V.), Aalborg University, DK-9220 Aalborg, Denmark; Departments of Clinical Biochemistry (S.L., A.H.) and Endocrinology (P.V.), Aalborg University Hospital, DK-9000 Aalborg, Denmark
| | - Ellen-Magrethe Hauge
- Departments of Endocrinology and Internal Medicine (J.S.-L., S.G., L.L.) and Rheumatology (E.-M.H.), Aarhus University Hospital, DK-8000 C Aarhus, Denmark; Department of Clinical Medicine (J.S.-L., A.H., P.V.), Aalborg University, DK-9220 Aalborg, Denmark; Departments of Clinical Biochemistry (S.L., A.H.) and Endocrinology (P.V.), Aalborg University Hospital, DK-9000 Aalborg, Denmark
| | - Bente Lomholt Langdahl
- Departments of Endocrinology and Internal Medicine (J.S.-L., S.G., L.L.) and Rheumatology (E.-M.H.), Aarhus University Hospital, DK-8000 C Aarhus, Denmark; Department of Clinical Medicine (J.S.-L., A.H., P.V.), Aalborg University, DK-9220 Aalborg, Denmark; Departments of Clinical Biochemistry (S.L., A.H.) and Endocrinology (P.V.), Aalborg University Hospital, DK-9000 Aalborg, Denmark
| | - Aase Handberg
- Departments of Endocrinology and Internal Medicine (J.S.-L., S.G., L.L.) and Rheumatology (E.-M.H.), Aarhus University Hospital, DK-8000 C Aarhus, Denmark; Department of Clinical Medicine (J.S.-L., A.H., P.V.), Aalborg University, DK-9220 Aalborg, Denmark; Departments of Clinical Biochemistry (S.L., A.H.) and Endocrinology (P.V.), Aalborg University Hospital, DK-9000 Aalborg, Denmark
| | - Peter Vestergaard
- Departments of Endocrinology and Internal Medicine (J.S.-L., S.G., L.L.) and Rheumatology (E.-M.H.), Aarhus University Hospital, DK-8000 C Aarhus, Denmark; Department of Clinical Medicine (J.S.-L., A.H., P.V.), Aalborg University, DK-9220 Aalborg, Denmark; Departments of Clinical Biochemistry (S.L., A.H.) and Endocrinology (P.V.), Aalborg University Hospital, DK-9000 Aalborg, Denmark
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Shanbhogue VV, Hansen S, Frost M, Jørgensen NR, Hermann AP, Henriksen JE, Brixen K. Compromised cortical bone compartment in type 2 diabetes mellitus patients with microvascular disease. Eur J Endocrinol 2016; 174:115-24. [PMID: 26537860 DOI: 10.1530/eje-15-0860] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 11/04/2015] [Indexed: 01/11/2023]
Abstract
OBJECTIVE AND DESIGN Patients with type 2 diabetes mellitus (T2D) have an increased fracture risk despite a normal or elevated bone mineral density (BMD). The aim of this cross-sectional in vivo study was to assess parameters of peripheral bone microarchitecture, estimated bone strength and bone remodeling in T2D patients with and without diabetic microvascular disease (MVD+ and MVD- respectively) and to compare them with healthy controls. METHODS Fifty-one T2D patients (MVD+ group: n=25) were recruited from Funen Diabetic Database and matched for age, sex and height with 51 healthy subjects. High-resolution peripheral quantitative tomography (HR-pQCT) was used to assess bone structure at the non-dominant distal radius and tibia. Estimated bone strength was calculated using finite element analysis. Biochemical markers of bone turnover were measured in all participants. RESULTS After adjusting for BMI, MVD+ patients displayed lower cortical volumetric BMD (P=0.02) and cortical thickness (P=0.02) and higher cortical porosity at the radius (P=0.02) and a trend towards higher cortical porosity at the tibia (P=0.07) compared to controls. HR-pQCT parameters did not differ between MVD- and control subjects. Biochemical markers of bone turnover were significantly lower in MVD+ and MVD- patients compared to controls (all P<0.01). These were no significant correlations between disease duration, glycemic control (average glycated hemoglobin over the previous 3 years) and HR-pQCT parameters. CONCLUSION Cortical bone deficits are not a characteristic of all T2D patients but of a subgroup characterized by the presence of microvascular complications. Whether this influences fracture rates in these patients needs further investigation.
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Affiliation(s)
- Vikram V Shanbhogue
- Department of EndocrinologyOdense University Hospital, Institute of Clinical Research, University of Southern Denmark, Kloevervaenget 6.1.sal, DK-5000 Odense C, DenmarkDepartments of Diagnostics and Medicine MResearch Center for Ageing and Osteoporosis, Glostrup Hospital, Copenhagen, Denmark
| | - Stinus Hansen
- Department of EndocrinologyOdense University Hospital, Institute of Clinical Research, University of Southern Denmark, Kloevervaenget 6.1.sal, DK-5000 Odense C, DenmarkDepartments of Diagnostics and Medicine MResearch Center for Ageing and Osteoporosis, Glostrup Hospital, Copenhagen, Denmark
| | - Morten Frost
- Department of EndocrinologyOdense University Hospital, Institute of Clinical Research, University of Southern Denmark, Kloevervaenget 6.1.sal, DK-5000 Odense C, DenmarkDepartments of Diagnostics and Medicine MResearch Center for Ageing and Osteoporosis, Glostrup Hospital, Copenhagen, Denmark
| | - Niklas Rye Jørgensen
- Department of EndocrinologyOdense University Hospital, Institute of Clinical Research, University of Southern Denmark, Kloevervaenget 6.1.sal, DK-5000 Odense C, DenmarkDepartments of Diagnostics and Medicine MResearch Center for Ageing and Osteoporosis, Glostrup Hospital, Copenhagen, Denmark
| | - Anne Pernille Hermann
- Department of EndocrinologyOdense University Hospital, Institute of Clinical Research, University of Southern Denmark, Kloevervaenget 6.1.sal, DK-5000 Odense C, DenmarkDepartments of Diagnostics and Medicine MResearch Center for Ageing and Osteoporosis, Glostrup Hospital, Copenhagen, Denmark
| | - Jan Erik Henriksen
- Department of EndocrinologyOdense University Hospital, Institute of Clinical Research, University of Southern Denmark, Kloevervaenget 6.1.sal, DK-5000 Odense C, DenmarkDepartments of Diagnostics and Medicine MResearch Center for Ageing and Osteoporosis, Glostrup Hospital, Copenhagen, Denmark
| | - Kim Brixen
- Department of EndocrinologyOdense University Hospital, Institute of Clinical Research, University of Southern Denmark, Kloevervaenget 6.1.sal, DK-5000 Odense C, DenmarkDepartments of Diagnostics and Medicine MResearch Center for Ageing and Osteoporosis, Glostrup Hospital, Copenhagen, Denmark
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65
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Shanbhogue VV, Hansen S, Frost M, Jørgensen NR, Hermann AP, Henriksen JE, Brixen K. Bone Geometry, Volumetric Density, Microarchitecture, and Estimated Bone Strength Assessed by HR-pQCT in Adult Patients With Type 1 Diabetes Mellitus. J Bone Miner Res 2015; 30:2188-99. [PMID: 26096924 DOI: 10.1002/jbmr.2573] [Citation(s) in RCA: 117] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 05/25/2015] [Accepted: 06/08/2015] [Indexed: 12/28/2022]
Abstract
The primary goal of this cross-sectional in vivo study was to assess peripheral bone microarchitecture, bone strength, and bone remodeling in adult type 1 diabetes (T1D) patients with and without diabetic microvascular disease (MVD+ and MVD-, respectively) and to compare them with age-, gender-, and height-matched healthy control subjects (CoMVD+ and CoMVD-, respectively). The secondary goal was to assess differences in MVD- and MVD+ patients. Fifty-five patients with T1DM (MVD+ group: n = 29) were recruited from the Funen Diabetes Database. Dual-energy X-ray absorptiometry (DXA), high-resolution peripheral quantitative computed tomography (HR-pQCT) of the ultradistal radius and tibia, and biochemical markers of bone turnover were performed in all participants. There were no significant differences in HR-pQCT parameters between MVD- and CoMVD- subjects. In contrast, MVD+ patients had larger total and trabecular bone areas (p = 0.04 and p = 0.02, respectively), lower total, trabecular, and cortical volumetric bone mineral density (vBMD) (p < 0.01, p < 0.04, and p < 0.02, respectively), and thinner cortex (p = 0.03) at the radius, and lower total and trabecular vBMD (p = 0.01 and p = 0.02, respectively) at the tibia in comparison to CoMVD+. MVD+ patients also exhibited lower total and trabecular vBMD (radius p = 0.01, tibia p < 0.01), trabecular thickness (radius p = 0.01), estimated bone strength, and greater trabecular separation (radius p = 0.01, tibia p < 0.01) and network inhomogeneity (radius p = 0.01, tibia p < 0.01) in comparison to MVD- patients. These differences remained significant after adjustment for age, body mass index, gender, disease duration, and glycemic control (average glycated hemoglobin over the previous 3 years). Although biochemical markers of bone turnover were significantly lower in MVD+ and MVD- groups in comparison to controls, they were similar between the MVD+ and MVD- groups. The results of our study suggest that the presence of MVD was associated with deficits in cortical and trabecular bone vBMD and microarchitecture that could partly explain the excess skeletal fragility observed in these patients.
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Affiliation(s)
- Vikram V Shanbhogue
- Department of Endocrinology, Odense University Hospital, Odense, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Stinus Hansen
- Department of Endocrinology, Odense University Hospital, Odense, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Morten Frost
- Department of Endocrinology, Odense University Hospital, Odense, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Niklas Rye Jørgensen
- Institute of Clinical Research, University of Southern Denmark, Odense, Denmark.,Research Center for Ageing and Osteoporosis, Department of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark
| | - Anne Pernille Hermann
- Department of Endocrinology, Odense University Hospital, Odense, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Jan Erik Henriksen
- Department of Endocrinology, Odense University Hospital, Odense, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Kim Brixen
- Department of Endocrinology, Odense University Hospital, Odense, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
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66
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Füchtbauer L, Brusgaard K, Ledaal P, Frost M, Frederiksen AL. Case report: vitamin D-dependent rickets type 1 caused by a novel CYP27B1 mutation. Clin Case Rep 2015; 3:1012-6. [PMID: 26734137 PMCID: PMC4693699 DOI: 10.1002/ccr3.406] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 08/17/2015] [Accepted: 08/27/2015] [Indexed: 01/31/2023] Open
Abstract
Vitamin D‐dependent rickets type 1 VDDR‐1 is a recessive inherited disorder with impaired activation of vitamin D, caused by mutations in CYP27B1. We present long‐time follow‐up of a case with a novel mutation including high‐resolution peripheral quantitative computed tomography of the bone. Adequate treatment resulted in a normalized phenotype.
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Affiliation(s)
- Laila Füchtbauer
- Department of Endocrinology Sahlgrenska Universitetssjukhuset Gothenburg Sweden
| | - Klaus Brusgaard
- Department of Clinical Genetics Odense University Hospital Odense Denmark
| | - Pål Ledaal
- Pediatric Department Sygehus Sønderjylland Sønderborg Denmark
| | - Morten Frost
- Department of Endocrinology M Odense University Hospital Odense Denmark
| | - Anja L Frederiksen
- Department of Clinical Genetics Odense University Hospital Odense Denmark
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67
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Hung VWY, Zhu TY, Cheung WH, Fong TN, Yu FWP, Hung LK, Leung KS, Cheng JCY, Lam TP, Qin L. Age-related differences in volumetric bone mineral density, microarchitecture, and bone strength of distal radius and tibia in Chinese women: a high-resolution pQCT reference database study. Osteoporos Int 2015; 26:1691-703. [PMID: 25627115 DOI: 10.1007/s00198-015-3045-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2014] [Accepted: 01/18/2015] [Indexed: 01/23/2023]
Abstract
UNLABELLED In a cohort of 393 Chinese women, by using high-resolution peripheral quantitative computed tomography (HR-pQCT), we found that significant cortical bone loss occurred after midlife. Prominent increase in cortical porosity began at the fifth decade but reached a plateau before the sixth decade. Trabecular bone loss was already evident in young adulthood and continued throughout life. INTRODUCTION This study aimed to investigate age-related differences in volumetric bone mineral density (vBMD), microarchitecture, and estimated bone strength at peripheral skeleton in Chinese female population. METHODS In a cross-sectional cohort of 393 Chinese women aged 20-90 years, we obtained vBMD, microarchtecture, and micro-finite element-derived bone strength at distal radius and tibia using HR-pQCT. RESULTS The largest predictive age-related difference was found for cortical porosity (Ct.Po) which showed over four-fold and two-fold differences at distal radius and tibia, respectively, over the adulthood. At both sites, cortical bone area, vBMD, and thickness showed significant quadratic association with age with significant decrease beginning after midlife. Change of Ct.Po became more prominent between age of 50 and 57 (0.26 %/year at distal radius, 0.54 %/year at distal tibia, both p ≤ 0.001) but thereafter, reached a plateau (0.015 and 0.028 %/year, both p > 0.05). In contrast, trabecular vBMD and microarchitecture showed linear association with age with significant deterioration observed throughout adulthood. Estimated age of peak was around age of 20 for trabecular vBMD and microarchitecture and Ct.Po and age of 40 for cortical vBMD and microarchitecture. Estimated stiffness and failure load peaked at mid-30s at the distal radius and at age 20 at distal tibia. CONCLUSIONS Age-related differences in vBMD and microarchitecture in Chinese women differed by bone compartments. Significant cortical bone loss occurred after midlife. Prominent increase in Ct.Po began at the fifth decade but appeared to be arrested before the sixth decade. Loss of trabecular bone was already evident in young adulthood and continued throughout life.
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Affiliation(s)
- V W Y Hung
- Bone Quality and Health Centre, Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, SAR, China
| | - T Y Zhu
- Bone Quality and Health Centre, Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, SAR, China
| | - W-H Cheung
- Bone Quality and Health Centre, Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, SAR, China
- Joint ACC-CUHK Space Medicine Center on Health Maintenance of Musculoskeletal System (Shenzhen Base of ACC-CUHK State Key Lab of Basic and Applied Space Medicine), The Chinese University Shenzhen Research Institute, Shenzhen, China
| | - T-N Fong
- Bone Quality and Health Centre, Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, SAR, China
| | - F W P Yu
- Bone Quality and Health Centre, Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, SAR, China
| | - L-K Hung
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, SAR, China
| | - K-S Leung
- Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, SAR, China
- Joint ACC-CUHK Space Medicine Center on Health Maintenance of Musculoskeletal System (Shenzhen Base of ACC-CUHK State Key Lab of Basic and Applied Space Medicine), The Chinese University Shenzhen Research Institute, Shenzhen, China
| | - J C Y Cheng
- Bone Quality and Health Centre, Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, SAR, China
- Joint ACC-CUHK Space Medicine Center on Health Maintenance of Musculoskeletal System (Shenzhen Base of ACC-CUHK State Key Lab of Basic and Applied Space Medicine), The Chinese University Shenzhen Research Institute, Shenzhen, China
| | - T-P Lam
- Bone Quality and Health Centre, Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, SAR, China.
| | - L Qin
- Bone Quality and Health Centre, Department of Orthopaedics and Traumatology, The Chinese University of Hong Kong, Hong Kong, SAR, China.
- Translational Medicine Research and Development Center, Institute of Biomedical and Health Engineering, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.
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Farmer S, Vestergaard H, Hansen S, Shanbhogue VV, Shanbhoque VV, Stahlberg CI, Hermann AP, Frederiksen H. Bone geometry, bone mineral density, and micro-architecture in patients with myelofibrosis: a cross-sectional study using DXA, HR-pQCT, and bone turnover markers. Int J Hematol 2015; 102:67-75. [PMID: 25939704 DOI: 10.1007/s12185-015-1803-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Revised: 04/09/2015] [Accepted: 04/14/2015] [Indexed: 12/20/2022]
Abstract
Primary myelofibrosis (MF) is a severe chronic myeloproliferative neoplasm, progressing towards a terminal stage with insufficient haematopoiesis and osteosclerotic manifestations. Whilst densitometry studies have showed MF patients to have elevated bone mineral density, data on bone geometry and micro-structure assessed with non-invasive methods are lacking. We measured areal bone mineral density (aBMD) using dual-energy X-ray absorptiometry (DXA). Bone geometry, volumetric BMD, and micro-architecture were measured using high-resolution peripheral quantitative computed tomography (HR-pQCT). We compared the structural parameters of bones by comparing 18 patients with MF and healthy controls matched for age, sex, and height. Blood was analysed for biochemical markers of bone turnover in patients with MF. There were no significant differences in measurements of bone geometry, volumetric bone mineral density, and micro-structure between MF patients and matched controls. Estimated bone stiffness and bone strength were similar between MF patients and controls. The level of pro-collagen type 1 N-terminal pro-peptide (P1NP) was significantly increased in MF, which may indicate extensive collagen synthesis, one of the major diagnostic criteria in MF. We conclude that bone mineral density, geometry, and micro-architecture in this cohort of MF patients are comparable with those in healthy individuals.
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Affiliation(s)
- Sarah Farmer
- Department of Haematology, Odense University Hospital, Sdr. Boulevard 29, 5000, Odense C, Denmark,
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69
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Shanbhogue VV, Hansen S, Folkestad L, Brixen K, Beck-Nielsen SS. Bone geometry, volumetric density, microarchitecture, and estimated bone strength assessed by HR-pQCT in adult patients with hypophosphatemic rickets. J Bone Miner Res 2015; 30:176-83. [PMID: 25042721 DOI: 10.1002/jbmr.2310] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Revised: 07/02/2014] [Accepted: 07/08/2014] [Indexed: 11/07/2022]
Abstract
Hypophosphatemic rickets (HR) is characterized by a generalized mineralization defect. Although densitometric studies have found the patients to have an elevated bone mineral density (BMD), data on bone geometry and microstructure are scarce. The aim of this cross-sectional in vivo study was to assess bone geometry, volumetric BMD (vBMD), microarchitecture, and estimated bone strength in adult patients with HR using high-resolution peripheral quantitative computed tomography (HR-pQCT). Twenty-nine patients (aged 19 to 79 years; 21 female, 8 male patients), 26 of whom had genetically proven X-linked HR, were matched with respect to age and sex with 29 healthy subjects. Eleven patients were currently receiving therapy with calcitriol and phosphate for a median duration of 29.1 years (12.0 to 43.0 years). Because of the disproportionate short stature in HR, the region of interest in HR-pQCT images at the distal radius and tibia were placed in a constant proportion to the entire length of the bone in both patients and healthy volunteers. In age- and weight-adjusted models, HR patients had significantly higher total bone cross-sectional areas (radius 36%, tibia 20%; both p < 0.001) with significantly higher trabecular bone areas (radius 49%, tibia 14%; both p < 0.001) compared with controls. In addition, HR patients had lower total vBMD (radius -20%, tibia -14%; both p < 0.01), cortical vBMD (radius -5%, p < 0.001), trabecular number (radius -13%, tibia -14%; both p < 0.01), and cortical thickness (radius -19%; p < 0.01) compared with controls, whereas trabecular spacing (radius 18%, tibia 23%; p < 0.01) and trabecular network inhomogeneity (radius 29%, tibia 40%; both p < 0.01) were higher. Estimated bone strength was similar between the groups. In conclusion, in patients with HR, the negative impact of lower vBMD and trabecular number on bone strength seems to be compensated by an increase in bone diameter, resulting in HR patients having normal estimates of bone strength. © 2014 American Society for Bone and Mineral Research.
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Affiliation(s)
- Vikram V Shanbhogue
- Department of Endocrinology, Odense University Hospital, Odense, Denmark; Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
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70
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Frederiksen AL, Hansen S, Brixen K, Frost M. Increased cortical area and thickness in the distal radius in subjects with SHOX-gene mutation. Bone 2014; 69:23-9. [PMID: 25220427 DOI: 10.1016/j.bone.2014.09.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 08/16/2014] [Accepted: 09/01/2014] [Indexed: 11/25/2022]
Abstract
INTRODUCTION Short-stature homeobox (SHOX) gene haploinsufficiency may cause skeletal dysplasia including Léri-Weill Dyschondrosteosis (LWD), a clinical entity characterised by the triad of low height, mesomelic disproportion and Madelung's deformity of the wrist. Bone microarchitecture and estimated strength in adult SHOX mutation carriers have not been examined. METHODS Twenty-two subjects with a SHOX mutation including 7 males and 15 females with a median age of 38.8 [21.1-52.2] years were recruited from five unrelated families. The control group consisted of 22 healthy subjects matched on age and sex. Bone mineral density (BMD) was measured by dual-energy X-ray absorptiometry. Bone geometry, volumetric density, microarchitecture and finite element estimated (FEA) bone strength were measured using high-resolution peripheral quantitative computed tomography (HR-pQCT). A full region of interest (ROI) image analysis and height-matched ROI analyses adjusting for differences in body height between the two groups were performed. RESULTS Areal BMD and T-scores showed no significant differences between cases and controls. Total radius area was smaller in cases than controls (207 [176-263] vs. 273 [226-298] mm, p<0.01). Radius cortical bone area (74 ± 20 vs. 58 ± 17 mm(2), p=0.01) and thickness (1.16 ± 0.30 vs. 0.84 ± 0.26 mm, p<0.01) as well as total density (428 ± 99 vs. 328 ± 72 mg/cm(3), p<0.01) were higher in SHOX mutation carriers compared to controls. Radius trabecular bone area (119 [103-192] vs. 202 [168-247] mm(2), p<0.01) and trabecular number (1.61 [1.46-2.07] vs. 1.89 [1.73-2.08] mm(-1), p=0.01) were smaller in SHOX mutation carriers. Tibia trabecular thickness was lower in cases (0.067 ± 0.012 vs. 0.076 ± 0.012 mm, p=0.01). These results remained significant after adjustment for differences in body height and when restricting analyses to females. There were no differences in BMD, radius and tibia cortical porosity or FEA failure load between groups. A segment of cortical bone defect was identified in the distal radius adjacent to ulna in five unrelated SHOX mutation carriers. CONCLUSION Subjects with a SHOX mutation presented with a different bone geometry in radius and tibia while there were no differences in BMD or failure load compared to controls, suggesting that mutations in SHOX gene may have an impact on bone microarchitecture albeit not bone strength.
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Affiliation(s)
- A L Frederiksen
- Department of Clinical Genetics, Odense University Hospital, Sdr. Boulevard 29, DK-5000 Odense, Denmark.
| | - S Hansen
- Department of Endocrinology, Odense University Hospital, Sdr. Boulevard 29, DK-5000 Odense, Denmark
| | - K Brixen
- Department of Endocrinology, Odense University Hospital, Sdr. Boulevard 29, DK-5000 Odense, Denmark
| | - M Frost
- Department of Endocrinology, Odense University Hospital, Sdr. Boulevard 29, DK-5000 Odense, Denmark
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Abstract
The WHO clinical definition of osteoporosis, based on a measurement of bone mineral density (BMD) by Dual Energy X-ray Absorptiometry, has been used globally since the mid-1990s. However, although this definition identifies those at greatest individual risk of fracture, in the population overall a greater total number of fractures occur in individuals with BMD values above the osteoporosis threshold. The inclusion of clinical risk factors, with or without BMD, in fracture prediction algorithms can improve the identification of individuals at high fracture risk; thus a number of web-based tools have been developed, the most commonly used globally being FRAX(®). In this review, we will discuss the epidemiology of osteoporosis, clinical risk factors for fragility fracture, and how this knowledge is being used to aid risk stratification. Importantly, research is on-going to demonstrate the clinical efficacy and cost-effectiveness of such case-finding strategies.
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Affiliation(s)
- Rebecca J Moon
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton SO16 6YD, UK; Paediatric Endocrinology, Southampton University Hospital NHS Foundation Trust, Southampton SO16 6YD, UK
| | - Nicholas C Harvey
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton SO16 6YD, UK; NIHR Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton NHS Foundation Trust, Tremona Road, Southampton SO16 6YD, UK.
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Hansen S, Gudex C, Åhrberg F, Brixen K, Voss A. Bone geometry, volumetric bone mineral density, microarchitecture and estimated bone strength in Caucasian females with systemic lupus erythematosus. A cross-sectional study using HR-pQCT. Calcif Tissue Int 2014; 95:530-9. [PMID: 25326144 DOI: 10.1007/s00223-014-9918-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Accepted: 10/08/2014] [Indexed: 12/13/2022]
Abstract
Patients with systemic lupus erythematosus (SLE) have an increased risk of fracture. We used high resolution peripheral quantitative computed tomography (HR-pQCT) to measure bone geometry, volumetric bone mineral density (vBMD), cortical and trabecular microarchitecture and estimated bone strength by finite element analysis (FEA) at the distal radius and tibia to assess bone characteristics beyond BMD that may contribute to the increased risk of fracture. Thirty-three Caucasian women with SLE (median age 48, range 21-64 years) and 99 controls (median age 45, range 21-64 years) were studied. Groups were comparable in radius regarding geometry and vBMD, but SLE patients had lower trabecular number (-7%, p < 0.05), higher trabecular separation (13%, p < 0.05) and lower FEA-estimated failure load compared to controls (-10%, p < 0.05). In tibia, SLE patients had lower total vBMD (-11%, p < 0.01), cortical area (-14%, p < 0.001) and cortical thickness (-16%, p < 0.001) and higher trabecular area (8%, p < 0.05). In subgroup analyses of the premenopausal participants (SLE n = 21, controls n = 63), SLE patients had significantly lower trabecular bone volume fraction [(BV/TV); -17%, p < 0.01], trabecular number (-9%, p < 0.01), trabecular thickness (-9%, p < 0.05) and higher trabecular separation (13%, p < 0.01) and trabecular network inhomogeneity (14%, p < 0.05) in radius along with lower BV/TV (-15%, p < 0.01) and higher trabecular separation (11%, p < 0.05) in tibia. FEA-estimated bone strength was lower in both radius (-11%, p < 0.01) and tibia (-10%, p < 0.05). In conclusion, Caucasian women with SLE compared to controls had fewer and more widely separated trabeculae and lower estimated bone strength in radius and lower total vBMD, cortical area and thickness in tibia.
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Affiliation(s)
- Stinus Hansen
- Department of Endocrinology, Odense University Hospital, Kloevervaenget 6.1.sal, 5000, Odense C, Denmark,
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73
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Vanderschueren D, Laurent MR, Claessens F, Gielen E, Lagerquist MK, Vandenput L, Börjesson AE, Ohlsson C. Sex steroid actions in male bone. Endocr Rev 2014; 35:906-60. [PMID: 25202834 PMCID: PMC4234776 DOI: 10.1210/er.2014-1024] [Citation(s) in RCA: 184] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Sex steroids are chief regulators of gender differences in the skeleton, and male gender is one of the strongest protective factors against osteoporotic fractures. This advantage in bone strength relies mainly on greater cortical bone expansion during pubertal peak bone mass acquisition and superior skeletal maintenance during aging. During both these phases, estrogens acting via estrogen receptor-α in osteoblast lineage cells are crucial for male cortical and trabecular bone, as evident from conditional genetic mouse models, epidemiological studies, rare genetic conditions, genome-wide meta-analyses, and recent interventional trials. Genetic mouse models have also demonstrated a direct role for androgens independent of aromatization on trabecular bone via the androgen receptor in osteoblasts and osteocytes, although the target cell for their key effects on periosteal bone formation remains elusive. Low serum estradiol predicts incident fractures, but the highest risk occurs in men with additionally low T and high SHBG. Still, the possible clinical utility of serum sex steroids for fracture prediction is unknown. It is likely that sex steroid actions on male bone metabolism rely also on extraskeletal mechanisms and cross talk with other signaling pathways. We propose that estrogens influence fracture risk in aging men via direct effects on bone, whereas androgens exert an additional antifracture effect mainly via extraskeletal parameters such as muscle mass and propensity to fall. Given the demographic trends of increased longevity and consequent rise of osteoporosis, an increased understanding of how sex steroids influence male bone health remains a high research priority.
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Affiliation(s)
- Dirk Vanderschueren
- Clinical and Experimental Endocrinology (D.V.) and Gerontology and Geriatrics (M.R.L., E.G.), Department of Clinical and Experimental Medicine; Laboratory of Molecular Endocrinology, Department of Cellular and Molecular Medicine (M.R.L., F.C.); and Centre for Metabolic Bone Diseases (D.V., M.R.L., E.G.), KU Leuven, B-3000 Leuven, Belgium; and Center for Bone and Arthritis Research (M.K.L., L.V., A.E.B., C.O.), Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, 413 45 Gothenburg, Sweden
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74
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Shanbhogue VV, Hansen S, Jørgensen NR, Brixen K, Gravholt CH. Bone geometry, volumetric density, microarchitecture, and estimated bone strength assessed by HR-pQCT in Klinefelter syndrome. J Bone Miner Res 2014; 29:2474-82. [PMID: 24806509 DOI: 10.1002/jbmr.2272] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2013] [Revised: 04/15/2014] [Accepted: 04/28/2014] [Indexed: 11/07/2022]
Abstract
Although the expected skeletal manifestations of testosterone deficiency in Klinefelter's syndrome (KS) are osteopenia and osteoporosis, the structural basis for this is unclear. The aim of this study was to assess bone geometry, volumetric bone mineral density (vBMD), microarchitecture, and estimated bone strength using high-resolution peripheral quantitative computed tomography (HR-pQCT) in patients with KS. Thirty-one patients with KS confirmed by lymphocyte chromosome karyotyping aged 35.8 ± 8.2 years were recruited consecutively from a KS outpatient clinic and matched with respect to age and height with 31 healthy subjects aged 35.9 ± 8.2 years. Dual-energy X-ray absorptiometry (DXA) and HR-pQCT were performed in all participants, and blood samples were analyzed for hormonal status and bone biomarkers in KS patients. Twenty-one KS patients were on long-term testosterone-replacement therapy. In weight-adjusted models, HR-pQCT revealed a significantly lower cortical area (p < 0.01), total and trabecular vBMD (p = 0.02 and p = 0.04), trabecular bone volume fraction (p = 0.04), trabecular number (p = 0.05), and estimates of bone strength, whereas trabecular spacing was higher (p = 0.03) at the tibia in KS patients. In addition, cortical thickness was significantly reduced, both at the radius and tibia (both p < 0.01). There were no significant differences in indices of bone structure, estimated bone strength, or bone biomarkers in KS patients with and without testosterone therapy. This study showed that KS patients had lower total vBMD and a compromised trabecular compartment with a reduced trabecular density and bone volume fraction at the tibia. The compromised trabecular network integrity attributable to a lower trabecular number with relative preservation of trabecular thickness is similar to the picture found in women with aging. KS patients also displayed a reduced cortical area and thickness at the tibia, which in combination with the trabecular deficits, compromised estimated bone strength at this site.
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Affiliation(s)
- Vikram V Shanbhogue
- Department of Endocrinology, Odense University Hospital, Odense, Denmark; Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
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Kawalilak CE, Johnston JD, Olszynski WP, Kontulainen SA. Characterizing microarchitectural changes at the distal radius and tibia in postmenopausal women using HR-pQCT. Osteoporos Int 2014; 25:2057-66. [PMID: 24781379 DOI: 10.1007/s00198-014-2719-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 04/11/2014] [Indexed: 10/25/2022]
Abstract
UNLABELLED Limited prospective evidence exists regarding bone microarchitectural deterioration. We report annual changes in trabecular and cortical bone microarchitecture at the distal radius and tibia in postmenopausal women. Lost trabeculae with corresponding increase in trabecular thickness at the radius and thinning tibial cortex indicated trabecularization of the cortex at both sites. INTRODUCTION Osteoporosis is characterized by low bone mass and the deterioration of bone microarchitecture. However, limited prospective evidence exists regarding bone microarchitectural changes in postmenopausal women: a population prone to sustaining osteoporotic fractures. Our primary objective was to characterize the annual change in bone area, density, and microarchitecture at the distal radius and distal tibia in postmenopausal women. METHODS Distal radius and tibia were measured using high-resolution peripheral quantitative computed tomography (HR-pQCT) at baseline and 1 year later in 51 women (mean age ± SD, 77 ± 7 years) randomly sampled from the Saskatoon cohort of the Canadian Multicentre Osteoporosis Study (CaMos). We used repeated measures analysis of variance (ANOVA) with Bonferroni adjustment for multiple comparisons to characterize the mean annual change in total density, cortical perimeter, trabecular and cortical bone area, density, content, and microarchitecture. Significant changes were accepted at P < 0.05. RESULTS At the distal radius in women without bone-altering drugs, total density (-1.7%) and trabecular number (-6.4%) decreased, while trabecular thickness (+6.0%), separation (+8.6%), and heterogeneity (+12.1%) increased. At their distal tibia, cortical area (-4.5%), density (-1.9%), content (-6.3%), and thickness (-4.4%) decreased, while trabecular area (+0.4%) increased. CONCLUSIONS The observed loss of trabeculae with concomitant increase in trabecular size at the distal radius and the declined cortical thickness, density, and content at the distal tibia indicated a site-specific trabecularization of the cortical bone in postmenopausal women.
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Affiliation(s)
- C E Kawalilak
- College of Kinesiology, University of Saskatchewan, 87 Campus Drive, Saskatoon, SK, S7N 5B2, Canada,
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