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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">The Prevalence of Fragility Fractures in a Population of a Region of Southern Italy Affected by Thyroid Disorders</title><author><name sortKey="Maccagnano, Giuseppe" sort="Maccagnano, Giuseppe" uniqKey="Maccagnano G" first="Giuseppe" last="Maccagnano">Giuseppe Maccagnano</name><affiliation><nlm:aff id="I1">Orthopaedics Unit, Department of Basic Medical Science, Neuroscience and Sensory Organs, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author><author><name sortKey="Notarnicola, Angela" sort="Notarnicola, Angela" uniqKey="Notarnicola A" first="Angela" last="Notarnicola">Angela Notarnicola</name><affiliation><nlm:aff id="I1">Orthopaedics Unit, Department of Basic Medical Science, Neuroscience and Sensory Organs, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author><author><name sortKey="Pesce, Vito" sort="Pesce, Vito" uniqKey="Pesce V" first="Vito" last="Pesce">Vito Pesce</name><affiliation><nlm:aff id="I1">Orthopaedics Unit, Department of Basic Medical Science, Neuroscience and Sensory Organs, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author><author><name sortKey="Mudoni, Simona" sort="Mudoni, Simona" uniqKey="Mudoni S" first="Simona" last="Mudoni">Simona Mudoni</name><affiliation><nlm:aff id="I2">Department of Biomedical Sciences and Human Oncology, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author><author><name sortKey="Tafuri, Silvio" sort="Tafuri, Silvio" uniqKey="Tafuri S" first="Silvio" last="Tafuri">Silvio Tafuri</name><affiliation><nlm:aff id="I2">Department of Biomedical Sciences and Human Oncology, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author><author><name sortKey="Moretti, Biagio" sort="Moretti, Biagio" uniqKey="Moretti B" first="Biagio" last="Moretti">Biagio Moretti</name><affiliation><nlm:aff id="I1">Orthopaedics Unit, Department of Basic Medical Science, Neuroscience and Sensory Organs, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">27807539</idno><idno type="pmc">5078635</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5078635</idno><idno type="RBID">PMC:5078635</idno><idno type="doi">10.1155/2016/6017165</idno><date when="2016">2016</date><idno type="wicri:Area/Pmc/Corpus">003C28</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">003C28</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">The Prevalence of Fragility Fractures in a Population of a Region of Southern Italy Affected by Thyroid Disorders</title><author><name sortKey="Maccagnano, Giuseppe" sort="Maccagnano, Giuseppe" uniqKey="Maccagnano G" first="Giuseppe" last="Maccagnano">Giuseppe Maccagnano</name><affiliation><nlm:aff id="I1">Orthopaedics Unit, Department of Basic Medical Science, Neuroscience and Sensory Organs, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author><author><name sortKey="Notarnicola, Angela" sort="Notarnicola, Angela" uniqKey="Notarnicola A" first="Angela" last="Notarnicola">Angela Notarnicola</name><affiliation><nlm:aff id="I1">Orthopaedics Unit, Department of Basic Medical Science, Neuroscience and Sensory Organs, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author><author><name sortKey="Pesce, Vito" sort="Pesce, Vito" uniqKey="Pesce V" first="Vito" last="Pesce">Vito Pesce</name><affiliation><nlm:aff id="I1">Orthopaedics Unit, Department of Basic Medical Science, Neuroscience and Sensory Organs, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author><author><name sortKey="Mudoni, Simona" sort="Mudoni, Simona" uniqKey="Mudoni S" first="Simona" last="Mudoni">Simona Mudoni</name><affiliation><nlm:aff id="I2">Department of Biomedical Sciences and Human Oncology, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author><author><name sortKey="Tafuri, Silvio" sort="Tafuri, Silvio" uniqKey="Tafuri S" first="Silvio" last="Tafuri">Silvio Tafuri</name><affiliation><nlm:aff id="I2">Department of Biomedical Sciences and Human Oncology, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author><author><name sortKey="Moretti, Biagio" sort="Moretti, Biagio" uniqKey="Moretti B" first="Biagio" last="Moretti">Biagio Moretti</name><affiliation><nlm:aff id="I1">Orthopaedics Unit, Department of Basic Medical Science, Neuroscience and Sensory Organs, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</nlm:aff></affiliation></author></analytic><series><title level="j">BioMed Research International</title><idno type="ISSN">2314-6133</idno><idno type="eISSN">2314-6141</idno><imprint><date when="2016">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>In the literature there is no clear evidence of a relationship between thyropathies and fragility fractures. The aim of our study is to define the prevalence of thyroid disease in a study sample made up of subjects with fragility fractures and from the same geographical area. We retrospectively studied the “hospital discharge records” (HDR) in the Apulian Database for the period 2008–2013 in order to identify all those patients with fragility fractures that required hospitalization. After detecting the prevalent population, we identified the patients affected by thyroid disease. We observed that, between 2008 and 2013 in Apulia, 16,636 patients were affected by hyperthyroidism. In the same period there were 92,341 subjects with hypothyroidism. The incidence of fragility fractures was 4.5% in the population with hyperthyroidism. As regards the population with hypothyroidism, the incidence of fragility fractures was 3.7%. Furthermore, we assessed the statistical connection between thyroid disease and fragility fractures revealing a higher incidence in patients with hyperthyroidism and clinical hypothyroidism.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Reginster, J Y" uniqKey="Reginster J">J.-Y. Reginster</name></author><author><name sortKey="Burlet, N" uniqKey="Burlet N">N. Burlet</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Piscitelli, P" uniqKey="Piscitelli P">P. Piscitelli</name></author><author><name sortKey="Iolascon, G" uniqKey="Iolascon G">G. Iolascon</name></author><author><name sortKey="Gimigliano, F" uniqKey="Gimigliano F">F. Gimigliano</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Kanis, J A" uniqKey="Kanis J">J. A. Kanis</name></author><author><name sortKey="Burlet, N" uniqKey="Burlet N">N. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Biomed Res Int</journal-id><journal-id journal-id-type="iso-abbrev">Biomed Res Int</journal-id><journal-id journal-id-type="publisher-id">BMRI</journal-id><journal-title-group><journal-title>BioMed Research International</journal-title></journal-title-group><issn pub-type="ppub">2314-6133</issn><issn pub-type="epub">2314-6141</issn><publisher><publisher-name>Hindawi Publishing Corporation</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">27807539</article-id><article-id pub-id-type="pmc">5078635</article-id><article-id pub-id-type="doi">10.1155/2016/6017165</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title>The Prevalence of Fragility Fractures in a Population of a Region of Southern Italy Affected by Thyroid Disorders</article-title></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0002-8596-2422</contrib-id><name><surname>Maccagnano</surname><given-names>Giuseppe</given-names></name><xref ref-type="aff" rid="I1"><sup>1</sup></xref><xref ref-type="corresp" rid="cor1"><sup>*</sup></xref></contrib><contrib contrib-type="author"><name><surname>Notarnicola</surname><given-names>Angela</given-names></name><xref ref-type="aff" rid="I1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Pesce</surname><given-names>Vito</given-names></name><xref ref-type="aff" rid="I1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Mudoni</surname><given-names>Simona</given-names></name><xref ref-type="aff" rid="I2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Tafuri</surname><given-names>Silvio</given-names></name><xref ref-type="aff" rid="I2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Moretti</surname><given-names>Biagio</given-names></name><xref ref-type="aff" rid="I1"><sup>1</sup></xref></contrib></contrib-group><aff id="I1"><sup>1</sup>Orthopaedics Unit, Department of Basic Medical Science, Neuroscience and Sensory Organs, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</aff><aff id="I2"><sup>2</sup>Department of Biomedical Sciences and Human Oncology, Faculty of Medicine and Surgery, University of Bari, General Hospital, Bari, Italy</aff><author-notes><corresp id="cor1">*Giuseppe Maccagnano: <email>g.maccagnano@gmail.com</email></corresp><fn fn-type="other"><p>Academic Editor: Zhiyong Hou</p></fn></author-notes><pub-date pub-type="ppub"><year>2016</year></pub-date><pub-date pub-type="epub"><day>11</day><month>10</month><year>2016</year></pub-date><volume>2016</volume><elocation-id>6017165</elocation-id><history><date date-type="received"><day>10</day><month>7</month><year>2016</year></date><date date-type="rev-recd"><day>7</day><month>9</month><year>2016</year></date><date date-type="accepted"><day>22</day><month>9</month><year>2016</year></date></history><permissions><copyright-statement>Copyright © 2016 Giuseppe Maccagnano et al.</copyright-statement><copyright-year>2016</copyright-year><license xlink:href="https://creativecommons.org/licenses/by/4.0/"><license-p>This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><p>In the literature there is no clear evidence of a relationship between thyropathies and fragility fractures. The aim of our study is to define the prevalence of thyroid disease in a study sample made up of subjects with fragility fractures and from the same geographical area. We retrospectively studied the “hospital discharge records” (HDR) in the Apulian Database for the period 2008–2013 in order to identify all those patients with fragility fractures that required hospitalization. After detecting the prevalent population, we identified the patients affected by thyroid disease. We observed that, between 2008 and 2013 in Apulia, 16,636 patients were affected by hyperthyroidism. In the same period there were 92,341 subjects with hypothyroidism. The incidence of fragility fractures was 4.5% in the population with hyperthyroidism. As regards the population with hypothyroidism, the incidence of fragility fractures was 3.7%. Furthermore, we assessed the statistical connection between thyroid disease and fragility fractures revealing a higher incidence in patients with hyperthyroidism and clinical hypothyroidism.</p></abstract></article-meta></front><body><sec id="sec1"><title>1. Introduction</title><p>Osteoporosis is currently the most common metabolic disease of the skeleton in the world, with an estimated prevalence of approximately 200 million people. The prevalence of the disease increases with an aging population and it is estimated that 30% of European women in menopause are suffering from osteoporosis [<xref rid="B1" ref-type="bibr">1</xref>]. The complications of osteoporosis are a major cause of disability and constitute one of the largest items in the budget of health expenditure in several countries, surpassing, according to some authors, myocardial infarction [<xref rid="B2" ref-type="bibr">2</xref>]. Fragility fractures (femoral, vertebral, humerus, wrist, tarsus, and metatarsus) are lesions due to mechanical stress not ordinarily resulting in fracture. Moreover, these lesions are caused by low-energy trauma according to National Institute for Health and Care Excellence. Fragility fractures are the most frequent complications of osteoporosis. However, numerous studies have shown that, in patients with low bone mass, all types of fractures are quite frequent. Furthermore, regardless of the skeletal segment concerned, the fracture event increases by 50–100% the likelihood of a subsequent fracture in a different location [<xref rid="B3" ref-type="bibr">3</xref>].</p><p>In the elderly population, the incidence of fragility fractures and chronic diseases is increasing [<xref rid="B4" ref-type="bibr">4</xref>]. In literature there are various works in which the authors have defined the association between osteoporosis and chronic diseases such as diabetes, hypertension, heart disease, and thyroid disease. As for the latter, in many works the association between hyperthyroidism and osteoporosis has been highlighted [<xref rid="B5" ref-type="bibr">5</xref>–<xref rid="B7" ref-type="bibr">7</xref>], while studies on the relationship between osteoporosis and hypothyroidism [<xref rid="B8" ref-type="bibr">8</xref>–<xref rid="B10" ref-type="bibr">10</xref>] are controversial and limited. In particular, some authors report an increased incidence of fragility fractures in hypothyroid patients on hormone replacement therapy (levothyroxine) [<xref rid="B10" ref-type="bibr">10</xref>, <xref rid="B11" ref-type="bibr">11</xref>]. Thyroid diseases are responsible for metabolic changes that interfere with cardiovascular, psychic, intestinal, muscle, and bone functions [<xref rid="B12" ref-type="bibr">12</xref>].</p><p>As regards the functional aspect of thyroid diseases, we recognize hypo- and hyperfunctioning. The relationship between thyroid function and phosphocalcium metabolism was reported for the first time in 1891 by Von Recklinghausen, who described hyperthyroidism in osteoporosis [<xref rid="B13" ref-type="bibr">13</xref>].</p><p>The patient affected with hyperthyroidism characterized by low serum levels of the hormone TSH (≤0.1 IU/L) has an increased risk of vertebral and nonvertebral fractures, respectively, 4.5 and 3.2 times more than those unaffected [<xref rid="B14" ref-type="bibr">14</xref>]. The pathogenesis is due to hypofunctioning of pituitary gland. The patients with hyperthyroidism suffer from a wide range of symptoms, for example, anxiety, palpitation, ophthalmopathy, sweating, and slimming while in the patients with hypothyroidism we may describe bradycardia, increased perception of cold, impairment of memory, goiter, lymphoedema of arms, and obesity. In the first case, there emerged hyperproduction of thyroid hormone due to different causes. In the case of hypothyroidism there is a lack of thyroid hormone synthesis with an increase of TSH hormone. The prevalence of hypothyroidism varies between about 0.1 and 2% [<xref rid="B15" ref-type="bibr">15</xref>]. The effect of thyroid hormone therapy on BMD shows conflicting results [<xref rid="B16" ref-type="bibr">16</xref>–<xref rid="B18" ref-type="bibr">18</xref>].</p><p>Several authors have underlined the role of replacement therapy as being responsible for the reduction of serum TSH levels which in turn adversely affects bone mineral density. As explained above, it is clear how important it is to define the epidemiological data of the national and regional territory in order to understand in terms of primary prevention and secondary and health economics the problem of fragility fractures in the thyreopatic population. The aim of our study is to determine the prevalence of thyroid disease in the study sample represented by individuals with fragility fractures and from the same geographical area.</p></sec><sec id="sec2"><title>2. Materials and Methods</title><p>We requested the consent of the local ethics committee, and we designed a retrospective observational clinical study. The authors conducted an epidemiological survey on patients who were admitted in different hospitals of the Orthopedics and Traumatology Unit of the Apulia Region. Apulia is a region of Southern Italy with a number of 4,090,266 inhabitants (given Istat updated to 31 December 2013). In order to identify all patients with fragility fractures that required hospitalization, we evaluated the hospital discharge record (HDR) in the period 2008–2013.</p><p>In particular, we selected all the Apulia inpatient males over 65 years of age and women over the age of 50 years whose HDR reported domestic accidents (low-trauma energy) in the “trauma field” and who did not die in hospital.</p><p>The database of patients with fragility fractures was analyzed using a key linkage individual sanitary code and eliminating all duplicates. This database represented the prevalent population used for the study. The definition of proportion of subjects with fragility fracture and thyroid disease was the primary outcome of the study.</p><p>The data sources were HDR: database of pharmaceutical prescriptions of medications band A and the database of the Regional Health Service of Apulia regarding patients exempt from paying medications for thyroid disease (<xref ref-type="fig" rid="fig1">Figure 1</xref>). A mining algorithm to select the subjects prevailing cohorts suffering from thyroid disease in 2008 was created, considering every person who, in that year, was hospitalized for thyroid disease or reported a prescription charge exemption for the disease or at least a prescription for a tracer drug.</p><p>The extracted records were then linked with the “tax code” field; the processing of the data was performed through the WAS MP11 software.</p><p>For the definition of the event, the thyroid diseases were reported according to the ICD-IX codes.</p><p>In particular, patients with hyperthyroidism were defined as follows:</p><p>(i) Every subject of the prevailing population who was hospitalized for a main cause correlated with hyperthyroidism, as follows. </p><p><italic>HDR Code of Hyperthyroidism</italic><list list-type="simple"><list-item><label> </label><p>242.0 DIFFUSE TOXIC GOITER</p></list-item><list-item><label> </label><p>242.1 NODULAR TOXIC GOITER</p></list-item><list-item><label> </label><p>242.2 MULTINODULAR TOXIC GOITER</p></list-item><list-item><label> </label><p>242.3 ASPECIFIC NODULAR TOXIC GOITER</p></list-item></list></p><p>(ii) Every subject with at least one of the following prescription drugs (ATC A010) ascertained through data linkage with the regional database of pharmaceutical prescriptions and those with the exemption code: 035 (BASEDOW DISEASE AND OTHER FORMS OF HYPERTHYROIDISM) as follows.</p><p><italic>Drugs Prescribed for Hyperthyroidism</italic><list list-type="simple"><list-item><label> </label><p>H03B ANTI THYROID DRUGS</p></list-item><list-item><label> </label><p>H03BA THIOURACIL</p></list-item><list-item><label> </label><p>H03BA01 METIL THIOURACIL</p></list-item><list-item><label> </label><p>H03BA02 PROPYL THIOURACIL</p></list-item><list-item><label> </label><p>H03BA03 BENZYL THIOURACIL</p></list-item><list-item><label> </label><p>H03BB IMIDAZOLE CONTAINING SULFUR</p></list-item><list-item><label> </label><p>H03BB01 CARBIMAZOLE</p></list-item><list-item><label> </label><p>H03BB52 TIAMAZOL</p></list-item><list-item><label> </label><p>H03BC PERCHLORATE</p></list-item><list-item><label> </label><p>H03BC01 POTASSIUM PERCHLORATE</p></list-item><list-item><label> </label><p>H03BX OTHER ANTI THYROID PREPARATIONS</p></list-item><list-item><label> </label><p>H03BX01 DIIODOTYROSINE</p></list-item><list-item><label> </label><p>H03BX02 DIBROMOTYROSINE</p></list-item><list-item><label> </label><p>H03CA IODIOTHERAPY</p></list-item></list></p><p>Similarly, patients with hypothyroidism were defined as follows.</p><p>(i) Every subject of the prevailing population who was hospitalized for a main cause correlated with hypothyroidism, as follows. </p><p><italic>HDR Code of Hypothyroidism</italic><list list-type="simple"><list-item><label> 243</label><p>CONGENITAL HYPOTHYROIDISM</p></list-item><list-item><label>244.1</label><p>OTHER HYPOTHIROIDISM TYPE DUE TO THYROID ABLATION</p></list-item><list-item><label>244.2</label><p>HYPOTHYROIDISM DUE TO IODIO</p></list-item><list-item><label>244.3</label><p>OTHER IATROGEN HYPOTHIROIDISM TYPE</p></list-item><list-item><label>244.8</label><p>OTHER ACQUIRED HYPOTHIROIDISM TYPE</p></list-item></list></p><p>(ii) Every subject with at least one of the following prescription drugs (ATC A010) ascertained through data linkage with the regional database of pharmaceutical prescriptions and those with the exemption code: 027 (congenital hypothyroidism, SEVERE ACQUIRED HYPOTHYROIDISM) (TSH values greater than 10 mU/L) as follows.</p><p><italic>Drugs Prescribed for Hypothyroidism</italic><list list-type="simple"><list-item><label> </label><p><list list-type="simple"><list-item><label>H03AA01 </label><p>LEVOTHYROXINE SODIUM</p></list-item><list-item><label>H03AA02 </label><p>LIOTHYRONINE SODIUM</p></list-item><list-item><label>H03AA03 </label><p>COMBINATION OF LEVOTHYROXINE AND LIOTHYRONINE</p></list-item><list-item><label>H03AA04 </label><p>TIRATRICOL</p></list-item><list-item><label>H03AA05 </label><p>THYROID GLAND PREPARATIONS</p></list-item></list></p></list-item></list></p><p>Furthermore, the authors defined the subject affected by hypothyroidism who was detected simultaneously in both the HDR database codes and the exemption codes but not in the drug prescription database; the subjects present in database 3 were defined as patients with hypothyroidism in treatment. The databases were linked using as a key linkage individual sanitary code and eliminating all duplicates. Data were stratified by age (50–54 years, 55–59 years, 60–64 years, 65–69 years, 70–74 years, 75–79 years, 80–84 years, and ≥85 years) and by gender (male and female).</p></sec><sec id="sec3"><title>3. Results</title><p>In Apulia, for the period between 2008 and 2013, we revealed 16,636 patients with hyperthyroidism of which 75% were female. The analysis by year class shows a greater distribution in 60–64 years of age range (<xref ref-type="table" rid="tab1">Table 1</xref>).</p><p>In the study period, we revealed 92,341 patients with hypothyroidism in Apulia. 84% were female, while the stratification by age showed a greater distribution in the 55–59 years' class (<xref ref-type="table" rid="tab2">Table 2</xref>). In the population of patients affected by hypothyroidism (92,341), 95.1% (87,842) presented clinical hypothyroidism while 4.9% (4,499) presented subclinical hypothyroidism and so were not in drug treatment.</p><p>For the period in question, the analysis of data of fragility fractures in the population with hyperthyroidism allowed us to detect an incidence value of 4.5% (741). The most frequent year class was 80–84 years and gender analysis showed a higher incidence in females than in males (85% versus 15%) (<xref ref-type="table" rid="tab3">Table 3</xref>).</p><p>As regards the population affected by hypothyroidism, the incidence of fragility fractures was 3.7% (3,450); the most frequent age group was 75–79 years. According to gender analysis, we found a higher incidence in females than in males (90% versus 10%) (<xref ref-type="table" rid="tab4">Table 4</xref>). The incidence of pathologic fractures in patients with subclinical hypothyroidism was 2.6% (118), and in subjects with clinical hypothyroidism it was 3.8% (3,332). The most frequent year class for the former was 60–64 years and for the latter 75–79 years (<xref ref-type="table" rid="tab5">Table 5</xref>). Analyzing the data of fractures regarding the site, the order of frequency did not change between the two groups (hyper- and hypothyroid) (<xref ref-type="table" rid="tab6">Table 6</xref>).</p></sec><sec id="sec4"><title>4. Discussion</title><p>The aim of our study was to determine through observation of a numerically significant sample the real influence of thyroid disease in the Apulian population affected by fragility fractures.</p><p>The relationship between hyperthyroidism and bone tissue was defined for the first time in 1890 by the author Von Recklinghausen who described the clinical history of a patient with hyperthyroidism and multiple fractures [<xref rid="B19" ref-type="bibr">19</xref>]. By observation of the Apulian population with hyperthyroidism, we defined a gender difference in favour of females and a higher incidence of this disease in the year class 60–64 (<xref ref-type="table" rid="tab1">Table 1</xref>). In accordance with literature, we verified an increase of the incidence value in the first age classes with the maximum value in the range 60–64 [<xref rid="B20" ref-type="bibr">20</xref>].</p><p>The etiological relationship has been recently confirmed by several authors, who found that the secondary hyperthyroidism in Graves' disease, toxic multinodular goiter, and adenoma of Plummer may modify mineral density and increase risk fracture [<xref rid="B21" ref-type="bibr">21</xref>, <xref rid="B22" ref-type="bibr">22</xref>].</p><p>Other studies have reported that the effects of hyperthyroidism on metabolism and bone mass are due to an imbalance between osteoblast and osteoclast activity and negative calcium intake. Imbalance causes a reduction of the remodeling process and decreases osteogenesis [<xref rid="B23" ref-type="bibr">23</xref>]; negative calcium intake is responsible for decreasing PTH and so modifying the hydroxylation of vitamin D [<xref rid="B24" ref-type="bibr">24</xref>].</p><p>As for the sample of subjects affected by hypothyroidism, in the period of observation, we found a higher number of subjects than those with hyperthyroidism (92,341 versus 16,636). Also in this case, the females were the most represented (84%), and regarding age, the highest number of cases was in the 55–59 years of age class and so younger than patients with hyperthyroidism, in accordance with the literature [<xref rid="B25" ref-type="bibr">25</xref>] (<xref ref-type="table" rid="tab2">Table 2</xref>).</p><p>In literature the relationship between hypothyroidism and fragility fracture is not well defined. The role of TSH is controversial; in fact different authors report contradictory effects on bone tissue. In the congenital hypothyroidism, there emerged a decrease in bone development and thyroid hormone administration increased bone ingrowth and mineral density [<xref rid="B26" ref-type="bibr">26</xref>, <xref rid="B27" ref-type="bibr">27</xref>]. In other studies, the effects of hormone replacement therapy are contradictory [<xref rid="B16" ref-type="bibr">16</xref>, <xref rid="B28" ref-type="bibr">28</xref>].</p><p>It is important to distinguish subclinical hypothyroidism and clinical hypothyroidism since in the latter, the subject is under hormone replacement treatment.</p><p>Furthermore, we assessed the relationship between thyroid disease and fragility fractures. In the subjects with hyperthyroidism, the incidence of fractures was 4.5%. The gender most represented was the female (<xref ref-type="table" rid="tab3">Table 3</xref>). According to the data of literature we confirm the increased risk of fragility fractures in patients with hyperthyroidism [<xref rid="B5" ref-type="bibr">5</xref>]. Moreover in our study we confirm a gender difference in favour of females (<xref ref-type="table" rid="tab3">Table 3</xref>).</p><p>As for the sample of the subjects with hypothyroidism, we verified a higher incidence of fractures in the subjects with clinical hypothyroidism with respect to subjects with subclinical hypothyroidism. This value was 3.8% versus 2.6%, respectively. In consideration of the limited difference between the two values, one might believe that this difference is not important; instead by careful analysis there emerged a high difference, in terms of sample number, between two groups. The group of subjects with clinical hypothyroidism is greater than the group with subclinical hypothyroidism (3,332 versus 118) (<xref ref-type="table" rid="tab5">Table 5</xref>).</p><p>In the literature, it is reported that, in the presence of high values of TSH (condition of hypothyroidism) or in cases of suppressed TSH (condition of hypothyroidism in treatment), there is an increased risk of fragility fractures [<xref rid="B29" ref-type="bibr">29</xref>]. From the data of our study, in consideration of the differences, in terms of increased incidence of fragility fractures in patients with clinical hypothyroidism compared to subclinical, we highlight the importance of the role of hormone replacement therapy. In fact, we may correlate the action of substitution treatment to the increased incidence of fractures and reduced importance of TSH. From our study, there emerged a direct relationship between hyperthyroidism and fragility fractures, confirming the different works in the bibliography; also for the sample of hypothyroidism, there emerged a direct correlation between hypothyroidism and fragility fractures. The authors believe the latter may be due to the lack of screening of osteoporosis in subjects with hypothyroidism. Indeed, while on the one hand, the increased risk of osteoporosis and fragility fractures in the patients with hyperthyroidism is known and for this reason the patients are screened, on the other hand the data in the literature are not yet clear and well defined for subjects with hypothyroidism. As emerged from the observation of our results, the subjects with hypothyroidism are nevertheless affected by fragility fractures. For this reason they should be considered affected by osteoporosis but not under treatment.</p><p>The observation of the fracture sites, in both samples, did not show any difference. Moreover the authors found the same order of fracture sites and that the femur represents the main site of fragility fractures in terms of statistical results for both groups.</p></sec><sec id="sec5"><title>5. Conclusion</title><p>Our study is the first that defines the prevalence of fragility fractures in relation to thyroid disease in a population of the same geographical area. The authors, by reaching the main objective and the observation of the Apulian population, confirm the role of thyroid disease as a risk factor in the onset of fragility fractures.</p><p>The data confirmed the increased risk of fragility fractures in the population affected by hyperthyroidism and hypothyroidism under treatment. The data also confirm that, besides TSH, hormone replacement therapy also plays an important role in inducing the alterations in bone mineral density. Furthermore, we define an increased risk of fragility fractures in hypothyroidism under treatment. The latter data were interpreted considering the hypothyroid patients with fragility fractures as subjects never screened for osteoporosis and thus affected by osteoporosis but never treated. 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Apulia, years 2008–2013.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1"> Year class</th><th align="center" rowspan="1" colspan="1">M</th><th align="center" rowspan="1" colspan="1">F</th><th align="center" rowspan="1" colspan="1">Total</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">50–54</td><td align="center" rowspan="1" colspan="1">426</td><td align="center" rowspan="1" colspan="1">1.816</td><td align="center" rowspan="1" colspan="1">2.242</td></tr><tr><td align="left" rowspan="1" colspan="1">55–59</td><td align="center" rowspan="1" colspan="1">584</td><td align="center" rowspan="1" colspan="1">1.863</td><td align="center" rowspan="1" colspan="1">2.447</td></tr><tr><td align="left" rowspan="1" colspan="1">60–64</td><td align="center" rowspan="1" colspan="1">658</td><td align="center" rowspan="1" colspan="1">1.799</td><td align="center" rowspan="1" colspan="1">2.457</td></tr><tr><td align="left" rowspan="1" colspan="1">65–69</td><td align="center" rowspan="1" colspan="1">664</td><td align="center" rowspan="1" colspan="1">1.550</td><td align="center" rowspan="1" colspan="1">2.214</td></tr><tr><td align="left" rowspan="1" colspan="1">70–74</td><td align="center" rowspan="1" colspan="1">611</td><td align="center" rowspan="1" colspan="1">1.452</td><td align="center" rowspan="1" colspan="1">2.063</td></tr><tr><td align="left" rowspan="1" colspan="1">75–79</td><td align="center" rowspan="1" colspan="1">622</td><td align="center" rowspan="1" colspan="1">1.599</td><td align="center" rowspan="1" colspan="1">2.221</td></tr><tr><td align="left" rowspan="1" colspan="1">80–84</td><td align="center" rowspan="1" colspan="1">440</td><td align="center" rowspan="1" colspan="1">1.317</td><td align="center" rowspan="1" colspan="1">1.757</td></tr><tr><td align="left" rowspan="1" colspan="1">≥85</td><td align="center" rowspan="1" colspan="1">212</td><td align="center" rowspan="1" colspan="1">1.023</td><td align="center" rowspan="1" colspan="1">1.235</td></tr><tr><td align="center" colspan="4" rowspan="1"><hr></hr></td></tr><tr><td align="left" rowspan="1" colspan="1">Total<break></break>%</td><td align="center" rowspan="1" colspan="1">4.217 <break></break>(25%)</td><td align="center" rowspan="1" colspan="1">12.419 <break></break>(75%)</td><td align="center" rowspan="1" colspan="1">16.636<break></break>100 (%)</td></tr></tbody></table></table-wrap><table-wrap id="tab2" orientation="portrait" position="float"><label>Table 2</label><caption><p>Prevalence of hypothyroidism, by sex and age group. Apulia, years 2008–2013.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Year class</th><th align="center" rowspan="1" colspan="1">M</th><th align="center" rowspan="1" colspan="1">F</th><th align="center" rowspan="1" colspan="1">Total</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">50–54</td><td align="center" rowspan="1" colspan="1">2051</td><td align="center" rowspan="1" colspan="1">14.078</td><td align="center" rowspan="1" colspan="1">16.129</td></tr><tr><td align="left" rowspan="1" colspan="1">55–59</td><td align="center" rowspan="1" colspan="1">2360</td><td align="center" rowspan="1" colspan="1">14.833</td><td align="center" rowspan="1" colspan="1">17.193</td></tr><tr><td align="left" rowspan="1" colspan="1">60–64</td><td align="center" rowspan="1" colspan="1">2546</td><td align="center" rowspan="1" colspan="1">14.186</td><td align="center" rowspan="1" colspan="1">16.732</td></tr><tr><td align="left" rowspan="1" colspan="1">65–69</td><td align="center" rowspan="1" colspan="1">2317</td><td align="center" rowspan="1" colspan="1">11.437</td><td align="center" rowspan="1" colspan="1">13.754</td></tr><tr><td align="left" rowspan="1" colspan="1">70–74</td><td align="center" rowspan="1" colspan="1">1976</td><td align="center" rowspan="1" colspan="1">9.384</td><td align="center" rowspan="1" colspan="1">11.360</td></tr><tr><td align="left" rowspan="1" colspan="1">75–79</td><td align="center" rowspan="1" colspan="1">1559</td><td align="center" rowspan="1" colspan="1">6.996</td><td align="center" rowspan="1" colspan="1">8.555</td></tr><tr><td align="left" rowspan="1" colspan="1">80–84</td><td align="center" rowspan="1" colspan="1">1076</td><td align="center" rowspan="1" colspan="1">4.262</td><td align="center" rowspan="1" colspan="1">5.338</td></tr><tr><td align="left" rowspan="1" colspan="1">≥85</td><td align="center" rowspan="1" colspan="1">666</td><td align="center" rowspan="1" colspan="1">2.614</td><td align="center" rowspan="1" colspan="1">3.280</td></tr><tr><td align="center" colspan="4" rowspan="1"><hr></hr></td></tr><tr><td align="left" rowspan="1" colspan="1">Total<break></break>%</td><td align="center" rowspan="1" colspan="1">14.551<break></break>(16%)</td><td align="center" rowspan="1" colspan="1">77.790<break></break>(84%)</td><td align="center" rowspan="1" colspan="1">92.341<break></break>(100%)</td></tr></tbody></table></table-wrap><table-wrap id="tab3" orientation="portrait" position="float"><label>Table 3</label><caption><p>Incidence of fragility fractures in patients with hyperthyroidism, by sex and year class. Apulia, years 2008–2013.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Year class</th><th align="center" rowspan="1" colspan="1">M</th><th align="center" rowspan="1" colspan="1">F</th><th align="center" rowspan="1" colspan="1">Total</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">50–54</td><td align="center" rowspan="1" colspan="1">3</td><td align="center" rowspan="1" colspan="1">24</td><td align="center" rowspan="1" colspan="1">27</td></tr><tr><td align="left" rowspan="1" colspan="1">55–59</td><td align="center" rowspan="1" colspan="1">9</td><td align="center" rowspan="1" colspan="1">37</td><td align="center" rowspan="1" colspan="1">46</td></tr><tr><td align="left" rowspan="1" colspan="1">60–64</td><td align="center" rowspan="1" colspan="1">16</td><td align="center" rowspan="1" colspan="1">49</td><td align="center" rowspan="1" colspan="1">65</td></tr><tr><td align="left" rowspan="1" colspan="1">65–69</td><td align="center" rowspan="1" colspan="1">10</td><td align="center" rowspan="1" colspan="1">68</td><td align="center" rowspan="1" colspan="1">78</td></tr><tr><td align="left" rowspan="1" colspan="1">70–74</td><td align="center" rowspan="1" colspan="1">14</td><td align="center" rowspan="1" colspan="1">68</td><td align="center" rowspan="1" colspan="1">82</td></tr><tr><td align="left" rowspan="1" colspan="1">75–79</td><td align="center" rowspan="1" colspan="1">18</td><td align="center" rowspan="1" colspan="1">138</td><td align="center" rowspan="1" colspan="1">156</td></tr><tr><td align="left" rowspan="1" colspan="1">80–84</td><td align="center" rowspan="1" colspan="1">25</td><td align="center" rowspan="1" colspan="1">134</td><td align="center" rowspan="1" colspan="1">159</td></tr><tr><td align="left" rowspan="1" colspan="1">≥85</td><td align="center" rowspan="1" colspan="1">14</td><td align="center" rowspan="1" colspan="1">114</td><td align="center" rowspan="1" colspan="1">128</td></tr><tr><td align="center" colspan="4" rowspan="1"><hr></hr></td></tr><tr><td align="left" rowspan="1" colspan="1">Total</td><td align="center" rowspan="1" colspan="1">109</td><td align="center" rowspan="1" colspan="1">632</td><td align="center" rowspan="1" colspan="1">741</td></tr></tbody></table></table-wrap><table-wrap id="tab4" orientation="portrait" position="float"><label>Table 4</label><caption><p>Incidence of fragility fractures in patients with hypothyroidism, by sex and year class. Apulia, years 2008–2013.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Year class</th><th align="center" rowspan="1" colspan="1">M</th><th align="center" rowspan="1" colspan="1">F</th><th align="center" rowspan="1" colspan="1">Total</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">50–54</td><td align="center" rowspan="1" colspan="1">12</td><td align="center" rowspan="1" colspan="1">231</td><td align="center" rowspan="1" colspan="1">243</td></tr><tr><td align="left" rowspan="1" colspan="1">55–59</td><td align="center" rowspan="1" colspan="1">40</td><td align="center" rowspan="1" colspan="1">277</td><td align="center" rowspan="1" colspan="1">317</td></tr><tr><td align="left" rowspan="1" colspan="1">60–64</td><td align="center" rowspan="1" colspan="1">40</td><td align="center" rowspan="1" colspan="1">371</td><td align="center" rowspan="1" colspan="1">411</td></tr><tr><td align="left" rowspan="1" colspan="1">65–69</td><td align="center" rowspan="1" colspan="1">38</td><td align="center" rowspan="1" colspan="1">404</td><td align="center" rowspan="1" colspan="1">442</td></tr><tr><td align="left" rowspan="1" colspan="1">70–74</td><td align="center" rowspan="1" colspan="1">42</td><td align="center" rowspan="1" colspan="1">504</td><td align="center" rowspan="1" colspan="1">546</td></tr><tr><td align="left" rowspan="1" colspan="1">75–79</td><td align="center" rowspan="1" colspan="1">60</td><td align="center" rowspan="1" colspan="1">553</td><td align="center" rowspan="1" colspan="1">613</td></tr><tr><td align="left" rowspan="1" colspan="1">80–84</td><td align="center" rowspan="1" colspan="1">59</td><td align="center" rowspan="1" colspan="1">461</td><td align="center" rowspan="1" colspan="1">520</td></tr><tr><td align="left" rowspan="1" colspan="1">≥85</td><td align="center" rowspan="1" colspan="1">51</td><td align="center" rowspan="1" colspan="1">307</td><td align="center" rowspan="1" colspan="1">358</td></tr><tr><td align="center" colspan="4" rowspan="1"><hr></hr></td></tr><tr><td align="left" rowspan="1" colspan="1">Total</td><td align="center" rowspan="1" colspan="1">342</td><td align="center" rowspan="1" colspan="1">3.108</td><td align="center" rowspan="1" colspan="1">3.450</td></tr></tbody></table></table-wrap><table-wrap id="tab5" orientation="portrait" position="float"><label>Table 5</label><caption><p>Incidence of fragility fractures in patients with hypothyroidism, subclinical and clinical, by year class. Apulia, years 2008–2013.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Year class</th><th align="center" rowspan="1" colspan="1">Subjects with subclinical hypothyroidism</th><th align="center" rowspan="1" colspan="1">Subjects with clinical hypothyroidism</th><th align="center" rowspan="1" colspan="1">Total</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">50–54</td><td align="center" rowspan="1" colspan="1">8</td><td align="center" rowspan="1" colspan="1">235</td><td align="center" rowspan="1" colspan="1">243</td></tr><tr><td align="left" rowspan="1" colspan="1">55–59</td><td align="center" rowspan="1" colspan="1">17</td><td align="center" rowspan="1" colspan="1">300</td><td align="center" rowspan="1" colspan="1">317</td></tr><tr><td align="left" rowspan="1" colspan="1">60–64</td><td align="center" rowspan="1" colspan="1">29</td><td align="center" rowspan="1" colspan="1">382</td><td align="center" rowspan="1" colspan="1">411</td></tr><tr><td align="left" rowspan="1" colspan="1">65–69</td><td align="center" rowspan="1" colspan="1">20</td><td align="center" rowspan="1" colspan="1">422</td><td align="center" rowspan="1" colspan="1">442</td></tr><tr><td align="left" rowspan="1" colspan="1">70–74</td><td align="center" rowspan="1" colspan="1">11</td><td align="center" rowspan="1" colspan="1">535</td><td align="center" rowspan="1" colspan="1">546</td></tr><tr><td align="left" rowspan="1" colspan="1">75–79</td><td align="center" rowspan="1" colspan="1">20</td><td align="center" rowspan="1" colspan="1">593</td><td align="center" rowspan="1" colspan="1">613</td></tr><tr><td align="left" rowspan="1" colspan="1">80–84</td><td align="center" rowspan="1" colspan="1">8</td><td align="center" rowspan="1" colspan="1">512</td><td align="center" rowspan="1" colspan="1">520</td></tr><tr><td align="left" rowspan="1" colspan="1">≥85</td><td align="center" rowspan="1" colspan="1">5</td><td align="center" rowspan="1" colspan="1">353</td><td align="center" rowspan="1" colspan="1">358</td></tr><tr><td align="center" colspan="4" rowspan="1"><hr></hr></td></tr><tr><td align="left" rowspan="1" colspan="1">Total</td><td align="center" rowspan="1" colspan="1">118</td><td align="center" rowspan="1" colspan="1">3332</td><td align="center" rowspan="1" colspan="1">3450</td></tr></tbody></table></table-wrap><table-wrap id="tab6" orientation="portrait" position="float"><label>Table 6</label><caption><p>Percentage of fragility fractures in patients with hypothyroidism and hyperthyroidism according to the fracture site. Apulia, years 2008–2013.</p></caption><table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="1" colspan="1">Fracture side</th><th align="center" rowspan="1" colspan="1">Patients with hypothyroidism</th><th align="center" rowspan="1" colspan="1">Patients with hyperthyroidism</th></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">Femur</td><td align="center" rowspan="1" colspan="1">42.9%</td><td align="center" rowspan="1" colspan="1">55.9%</td></tr><tr><td align="left" rowspan="1" colspan="1">Humerus</td><td align="center" rowspan="1" colspan="1">15.2%</td><td align="center" rowspan="1" colspan="1">13.6%</td></tr><tr><td align="left" rowspan="1" colspan="1">Forearm</td><td align="center" rowspan="1" colspan="1">12.8%</td><td align="center" rowspan="1" colspan="1">10.1%</td></tr><tr><td align="left" rowspan="1" colspan="1">Lumbar spine</td><td align="center" rowspan="1" colspan="1">11.2%</td><td align="center" rowspan="1" colspan="1">9.5%</td></tr><tr><td align="left" rowspan="1" colspan="1">Tibial pilon</td><td align="center" rowspan="1" colspan="1">10.4%</td><td align="center" rowspan="1" colspan="1">5.3%</td></tr><tr><td align="left" rowspan="1" colspan="1">Dorsal spine</td><td align="center" rowspan="1" colspan="1">5.6%</td><td align="center" rowspan="1" colspan="1">4.9%</td></tr><tr><td align="left" rowspan="1" colspan="1">Tarsus and metatarsus</td><td align="center" rowspan="1" colspan="1">1.5%</td><td align="center" rowspan="1" colspan="1">0.5%</td></tr><tr><td align="left" rowspan="1" colspan="1">Sacrum spine</td><td align="center" rowspan="1" colspan="1">0.4%</td><td align="center" rowspan="1" colspan="1">0.2%</td></tr></tbody></table></table-wrap></floats-group></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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