<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD JATS (Z39.96) Journal Publishing DTD v1.3 20210610//EN" "JATS-journalpublishing1-3.dtd">
<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">porozendo</journal-id><journal-title-group><journal-title xml:lang="ru">Остеопороз и остеопатии</journal-title><trans-title-group xml:lang="en"><trans-title>Osteoporosis and Bone Diseases</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2072-2680</issn><issn pub-type="epub">2311-0716</issn><publisher><publisher-name>Endocrinology Research Centre</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.14341/osteo2011314-18</article-id><article-id custom-type="elpub" pub-id-type="custom">porozendo-4053</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>ИЗМЕНЕНИЯ МИНЕРАЛЬНОЙ ПЛОТНОСТИ КОСТНОЙ ТКАНИ У БОЛЬНЫХ АНКИЛОЗИРУЮЩИМ СПОНДИЛОАРТРИТОМ</article-title><trans-title-group xml:lang="en"><trans-title>IZMENENIYa MINERAL'NOY PLOTNOSTI KOSTNOY TKANI U BOL'NYKh ANKILOZIRUYuShchIM SPONDILOARTRITOM</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>MYaSOUTOVA</surname><given-names>L. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>assistent kafedry gospital'noy terapii</p></bio><email xlink:type="simple">-</email></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>LAPShINA</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>k.m.n., assistent kafedry gospital'noy terapii</p></bio><email xlink:type="simple">-</email></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>SALIKhOV</surname><given-names>I. G.</given-names></name></name-alternatives><bio xml:lang="en"><p>zav. kafedroy gospital'noy terapii, professor, d.m.n., chlen-korrespondent AN RT, glavnyy revmatolog</p></bio><email xlink:type="simple">-</email></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>VASIL'EV</surname><given-names>A. G.</given-names></name></name-alternatives><bio xml:lang="en"><p>aspirant kafedry gospital'noy terapii</p></bio><email xlink:type="simple">-</email></contrib></contrib-group><pub-date pub-type="collection"><year>2011</year></pub-date><pub-date pub-type="epub"><day>15</day><month>12</month><year>2011</year></pub-date><volume>14</volume><issue>3</issue><issue-title>№3 (2011)</issue-title><fpage>14</fpage><lpage>18</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; MYaSOUTOVA L.I., LAPShINA S.A., SALIKhOV I.G., VASIL'EV A.G., 2011</copyright-statement><copyright-year>2011</copyright-year><copyright-holder xml:lang="ru">MYaSOUTOVA L.I., LAPShINA S.A., SALIKhOV I.G., VASIL'EV A.G.</copyright-holder><copyright-holder xml:lang="en">MYaSOUTOVA L.I., LAPShINA S.A., SALIKhOV I.G., VASIL'EV A.G.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.osteo-endojournals.ru/jour/article/view/4053">https://www.osteo-endojournals.ru/jour/article/view/4053</self-uri><abstract><p>Цель исследования — определить характер изменений МПК у пациентов АС в зависимости от демографических данных, клинических и лабораторных показателей. Материалы и методы. Иа базе Центра профилактики и лечения остеопороза г Казани проведено исследование 42 пациентов с достоверным диагнозом АО. мужчин — 36 (85,7%), женщин — 6 (14,3%), в возрасте от 21 до 47 лет (средний возраст 33,2±8,4), с длительностью заболевания 7,8±5,9 лет. Все пациенты были позитивны по HLA В27, поражение периферических суставов наблюдалось у 23 (54,8%) человек. исследование включало в себя оценку боли в спине, утренней скованности, измерение экскурсии грудной клетки, тест Шобера, определение индексов BASDAI и BASFI, ASDAS-CRP, сОЭ, сРБ. Для оценки МПК всем пациентам проведена двухэнергетическая рентгеновская абсорбциометрия DХA) поясничного отдела позвоночника L                  1-L                  4) и проксимального отдела бедренной кости. Результаты. среди мужчин нормальная МПК выявлялась у 6 (16,7%) человек, остеопения — у 19 (52,8%), ОП — у 11 (30,5%) пациентов. среди женщин нормальная МПК определялась у 1 (16,7%) человека, остеопения также у 1 (16,7%), ОП — у 4 (66,6%) женщин. МПК в поясничном отделе позвоночника у мужчин была значительно ниже, чем у женщин (р&lt;0,05). Пациенты с высокой лабораторной активностью и поражением периферических суставов имели достоверно более низкую МПК в поясничном отделе позвоночника. Пациенты с ОП и остеопенией имели более выраженный болевой синдром, чем пациенты с нормальной МПК. Выявлена корреляция МПК с длительностью Ас, тестом Шобера, активностью заболевания и уровнем сРБ. Выводы. Предикторами снижения МПК у пациентов с Ас являлись такие показатели, как высокая клиническая и лабораторная активность, периферический артрит, сниженный функциональный статус. Пациенты с ОП и остеопенией имели более выраженный болевой синдром.</p></abstract><trans-abstract xml:lang="en"><p>Objective. To determine a bone mineral density (BMD) changes in patients with ankylosing spondylitis (AS) depending on demographical data, clinical and laboratory findings. Materials and methods. 42 patients (male - 36 (85,7%), female - 6 (14,3%), 21 to 47 years of age, mean age 33,2±8,4, mean disease duration 7,8±5,9 years) with proven diagnosis of AS were included in the study performed at the Centre of osteoporosis treatment and prevention. All patients were HLA-B27 positive, 23 (54,8%) had peripheral arthritis. Evaluation included back pain assessment with VAS scale, morning stiffness duration assessment, modified Schober’s test, limitation of chest expansion assessment, calculation of BASDAI, BASFI and ASDAS-CRP scores, ESR and CRP levels. To evaluate BMD all patient underwent dual-emission X-ray absorptiometry (DXA) at lumbar spine (L1-L4) and hip neck. Results. Among male patients normal BMD was found in 6 (16,7%) patients, 19 (52,8%) had osteopenia, 11 (30,5%) -osteoporosis. Among male patients normal BMD was found in 1 (16,7%) patients, 1 (16,7%) had osteopenia, 4 (66,6°%) — osteoporosis. BMD at the lumbar spine in male patients was significantly higher compared to females (p&lt;0,05). Patients with high disease activity and peripheral arthritis had significantly lower BMD at lumbar spine. Patients with osteoporosis and osteopenia had higher pain score on VAS compared to patients with normal BMD. We observed an association between BMD and duration of AS, Schober’s test results, disease activity and CRP. Conclusion. High clinical activity, presence of peripheral arthritis, significant changes in spinal movement were found to be predictors of BMD decrease in patients with AS. Patients with AS and osteopenia had more pronounced pain syndrome.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>анкилозирующий спондилоартрит</kwd><kwd>остеопороз</kwd><kwd>остеопения</kwd><kwd>абсорбциометрия</kwd><kwd>минеральная плотность кости</kwd></kwd-group><kwd-group xml:lang="en"><kwd>ankylosing spondylitis</kwd><kwd>osteoporosis</kwd><kwd>osteopenia</kwd><kwd>absorptiometry</kwd><kwd>bone mineral density</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Braun, J. Building consensus on nomenclature and disease classification for ankylosing spondylitis: results and discussion of a questionnaire prepared for the international Workshop on New Treatment Strategies in Ankylosing Spondylitis, Berlin, Germany, 18-19 January 2002 / J. Braun, J. Sieper // Ann. Rheum. Dis. — 2002. — Vol.3. — P. 1161-1167.</mixed-citation><mixed-citation xml:lang="en">Braun, J. Building consensus on nomenclature and disease classification for ankylosing spondylitis: results and discussion of a questionnaire prepared for the international Workshop on New Treatment Strategies in Ankylosing Spondylitis, Berlin, Germany, 18-19 January 2002 / J. Braun, J. Sieper // Ann. Rheum. Dis. — 2002. — Vol.3. — P. 1161-1167.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Braun J., Bollow M., Remlinger G., et al. Prevalence of spondylarthropathies in HLA-B27 positive and negative blood donors. Arthritis Rheum. Jan 1998;41(1):58-67.</mixed-citation><mixed-citation xml:lang="en">Braun J., Bollow M., Remlinger G., et al. Prevalence of spondylarthropathies in HLA-B27 positive and negative blood donors. Arthritis Rheum. Jan 1998;41(1):58-67.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Braun J., Sieper J. Ankylosing spondylitis. Lancet. Apr 21 2007;369(9570):1379-90.</mixed-citation><mixed-citation xml:lang="en">Braun J., Sieper J. Ankylosing spondylitis. Lancet. Apr 21 2007;369(9570):1379-90.</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Gratacos J., Collado A., Pons F., et al.: Significant loss of bone mass in patients with early, active ankylosing spondylitis. A follow-up study. Arthritis Rheum 1999; 42: 2319-24.</mixed-citation><mixed-citation xml:lang="en">Gratacos J., Collado A., Pons F., et al.: Significant loss of bone mass in patients with early, active ankylosing spondylitis. A follow-up study. Arthritis Rheum 1999; 42: 2319-24.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Crotti T.N., Smith M.D., Weedon H. et al. Receptor activator NF-kappaB ligand (RANKL) expression in synovial tissue from patients with rheumatoid arthritis, spondyloarthropathy, osteoarthritis, and from normal patients: semiquantitative and quantitative analysis. Ann Rheum Dis 2002;61:1047-54.</mixed-citation><mixed-citation xml:lang="en">Crotti T.N., Smith M.D., Weedon H. et al. Receptor activator NF-kappaB ligand (RANKL) expression in synovial tissue from patients with rheumatoid arthritis, spondyloarthropathy, osteoarthritis, and from normal patients: semiquantitative and quantitative analysis. Ann Rheum Dis 2002;61:1047-54.</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Lange U., Kluge A., Strunk J. Ankylosing spondylitis and bone mineral density — what is the ideal tool for measurement. Rheumatol Int 2005; 26: 115-20.</mixed-citation><mixed-citation xml:lang="en">Lange U., Kluge A., Strunk J. Ankylosing spondylitis and bone mineral density — what is the ideal tool for measurement. Rheumatol Int 2005; 26: 115-20.</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Bessant R., Keat A. (2002) How should clinicians manage osteoporosis in ankylosing spondylitis? J Rheumatol 29, 1511-9.</mixed-citation><mixed-citation xml:lang="en">Bessant R., Keat A. (2002) How should clinicians manage osteoporosis in ankylosing spondylitis? J Rheumatol 29, 1511-9.</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Meireless E.S., Borelli A., Camargo O.P. Influence of disease activity and chronicity on ankylosing spondylitis bone mass loss. clin Rheumatol 1999;18:364-8.</mixed-citation><mixed-citation xml:lang="en">Meireless E.S., Borelli A., Camargo O.P. Influence of disease activity and chronicity on ankylosing spondylitis bone mass loss. clin Rheumatol 1999;18:364-8.</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Sinigaglia L., Varenna M., Girasole G., Bianchi G. Epidemiology of osteoporosis in rheumatic diseases. Rheum Dis Clin North Am 2006; 32:631-658.</mixed-citation><mixed-citation xml:lang="en">Sinigaglia L., Varenna M., Girasole G., Bianchi G. Epidemiology of osteoporosis in rheumatic diseases. Rheum Dis Clin North Am 2006; 32:631-658.</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Ulusoy H., Bilgici A., Kuru O. et al. Relationship between bone mineral density and disease activity in patients with ankylosing spondylitis. Turk J Rheumatol 2010; 25: 24-8.</mixed-citation><mixed-citation xml:lang="en">Ulusoy H., Bilgici A., Kuru O. et al. Relationship between bone mineral density and disease activity in patients with ankylosing spondylitis. Turk J Rheumatol 2010; 25: 24-8.</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Donnelly S., Doyle D.V., Denton A., Rolfe I., McCloskey E.V., Spector T.D. Bone mineral density and vertebral compression fracture rates in ankylosing spondylitis. Ann Rheum Dis 1994; 53: 117-21.</mixed-citation><mixed-citation xml:lang="en">Donnelly S., Doyle D.V., Denton A., Rolfe I., McCloskey E.V., Spector T.D. Bone mineral density and vertebral compression fracture rates in ankylosing spondylitis. Ann Rheum Dis 1994; 53: 117-21.</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Lee Y.S., Schlotzhauer T., Ott S.M., van Vollenhoven R.F., Hunter J., Shapiro J., et al. Skeletal status of men with early and late ankylosing spondylitis. Am J Med 1997; 103: 203-41.</mixed-citation><mixed-citation xml:lang="en">Lee Y.S., Schlotzhauer T., Ott S.M., van Vollenhoven R.F., Hunter J., Shapiro J., et al. Skeletal status of men with early and late ankylosing spondylitis. Am J Med 1997; 103: 203-41.</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Ralston SH, Urquhart GDK, Brzeski M et al. Prevalence of vertebral compression fracture due to osteoporosis in ankylosing spondylitis. Br Med J 1990; 300:563-565.</mixed-citation><mixed-citation xml:lang="en">Ralston SH, Urquhart GDK, Brzeski M et al. Prevalence of vertebral compression fracture due to osteoporosis in ankylosing spondylitis. Br Med J 1990; 300:563-565.</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Braun J., Pincus T. — Mortality, course and prognosis of patients with ankylosing spondylitis. Clin Exp Rheumatol 2002; 20:S16-S22.</mixed-citation><mixed-citation xml:lang="en">Braun J., Pincus T. — Mortality, course and prognosis of patients with ankylosing spondylitis. Clin Exp Rheumatol 2002; 20:S16-S22.</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Jun J.B., Joo K.B., Her M.Y., et al. Femoral bone mineral density is associated with vertebral fractures in patients with ankylosing spondylitis: a cross-sectional study. J Rheumatol 2006; 33:1637-1641.</mixed-citation><mixed-citation xml:lang="en">Jun J.B., Joo K.B., Her M.Y., et al. Femoral bone mineral density is associated with vertebral fractures in patients with ankylosing spondylitis: a cross-sectional study. J Rheumatol 2006; 33:1637-1641.</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Maksymovych W.P., Jhangri G.S., Leclercq S., Skeith K., Yan A, Russell AS. An open study of pamidronate in the treatment of refractory ankylosing spondylitis. J Rheumatol 1998; 25: 714-7.</mixed-citation><mixed-citation xml:lang="en">Maksymovych W.P., Jhangri G.S., Leclercq S., Skeith K., Yan A, Russell AS. An open study of pamidronate in the treatment of refractory ankylosing spondylitis. J Rheumatol 1998; 25: 714-7.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Allali F., Breban M., Procher R., Maillefert J.F., Dougados M., Roux C. Increase in bone mineral density of patients with spondyloarthropathy treated with anti-tumour necrosis factor. Ann Rheum Dis 2003; 63: 347-9.</mixed-citation><mixed-citation xml:lang="en">Allali F., Breban M., Procher R., Maillefert J.F., Dougados M., Roux C. Increase in bone mineral density of patients with spondyloarthropathy treated with anti-tumour necrosis factor. Ann Rheum Dis 2003; 63: 347-9.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">J. Sieper, M. Rudwaleit, X. Baraliakos et al. The Assessment of SpondyloArthritis international Society (ASAS) handbook: a guide to assess spondyloarthritis. Ann Rheum Dis 2009; 68(Suppl II):ii1-ii44.</mixed-citation><mixed-citation xml:lang="en">J. Sieper, M. Rudwaleit, X. Baraliakos et al. The Assessment of SpondyloArthritis international Society (ASAS) handbook: a guide to assess spondyloarthritis. Ann Rheum Dis 2009; 68(Suppl II):ii1-ii44.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">The world Health Organization (2007) Assessment of osteoporosis at the primary health care level — Summary report of a WHO Scientific Group. WHO, Geneva.</mixed-citation><mixed-citation xml:lang="en">The world Health Organization (2007) Assessment of osteoporosis at the primary health care level — Summary report of a WHO Scientific Group. WHO, Geneva.</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Binkley N., Bilezikian J.P., Kendler D.L., et al. (2007) Summary of the international society for clinical densitometry 2005 position development conference. J Bone Miner Res 22, 643.</mixed-citation><mixed-citation xml:lang="en">Binkley N., Bilezikian J.P., Kendler D.L., et al. (2007) Summary of the international society for clinical densitometry 2005 position development conference. J Bone Miner Res 22, 643.</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">El. Maghraoui, Borderie D., Cherruau B., Edouard R., Dougados M., Roux C. Osteoporosis, body composition, and bone turnover in ankylosing spondylitis. J Rheumatol 1999; 26: 2205-9.</mixed-citation><mixed-citation xml:lang="en">El. Maghraoui, Borderie D., Cherruau B., Edouard R., Dougados M., Roux C. Osteoporosis, body composition, and bone turnover in ankylosing spondylitis. J Rheumatol 1999; 26: 2205-9.</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Speden D.J., Calin A.I., Ring F.J., Bhalla A.K. Bone mineral density, calcaneal ultrasound, and bone turnover markers in women with ankylosing spondylitis. J Rheumatol 2002; 29: 516-21.</mixed-citation><mixed-citation xml:lang="en">Speden D.J., Calin A.I., Ring F.J., Bhalla A.K. Bone mineral density, calcaneal ultrasound, and bone turnover markers in women with ankylosing spondylitis. J Rheumatol 2002; 29: 516-21.</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Capaci K., Hepguler S., Argin M., et al — Bone mineral density in mild and advanced ankylosing spondylitis. Yonsei Med J 2003; 44:379-384.</mixed-citation><mixed-citation xml:lang="en">Capaci K., Hepguler S., Argin M., et al — Bone mineral density in mild and advanced ankylosing spondylitis. Yonsei Med J 2003; 44:379-384.</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Mitra D., Elvins D.M., Speden D.J., et al — The prevalence of vertebral fractures in mild ankylosing spondylitis and their relationship to bone mineral density. Rheumatology 2000; 39:85-89.</mixed-citation><mixed-citation xml:lang="en">Mitra D., Elvins D.M., Speden D.J., et al — The prevalence of vertebral fractures in mild ankylosing spondylitis and their relationship to bone mineral density. Rheumatology 2000; 39:85-89.</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">Toussirot E., Michel F., Wendling D. — Bone density, ultrasound measurements and body composition in early ankylosing spondylitis. Rheumatology 2001; 40: 882-888.</mixed-citation><mixed-citation xml:lang="en">Toussirot E., Michel F., Wendling D. — Bone density, ultrasound measurements and body composition in early ankylosing spondylitis. Rheumatology 2001; 40: 882-888.</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">Wendling D. — Bone loss in ankylosing spondylitis: Can we put the puzzle together? J Rheumatol 2005; 32:1184-1186.</mixed-citation><mixed-citation xml:lang="en">Wendling D. — Bone loss in ankylosing spondylitis: Can we put the puzzle together? J Rheumatol 2005; 32:1184-1186.</mixed-citation></citation-alternatives></ref><ref id="cit27"><label>27</label><citation-alternatives><mixed-citation xml:lang="ru">Dos Santos FP, Constantin A, Laroche M, et al — Whole body and regional bone mineral density in ankylosing spondylitis. J Rheumatol 2001; 28:547-549.</mixed-citation><mixed-citation xml:lang="en">Dos Santos FP, Constantin A, Laroche M, et al — Whole body and regional bone mineral density in ankylosing spondylitis. J Rheumatol 2001; 28:547-549.</mixed-citation></citation-alternatives></ref><ref id="cit28"><label>28</label><citation-alternatives><mixed-citation xml:lang="ru">Maillefert JF, Aho LS, El Maghraoui A, et al — Changes in bone density in patients with ankylosing spondylitis: a two-year follow-up study. Osteoporos Int 2001; 12:605-609.</mixed-citation><mixed-citation xml:lang="en">Maillefert JF, Aho LS, El Maghraoui A, et al — Changes in bone density in patients with ankylosing spondylitis: a two-year follow-up study. Osteoporos Int 2001; 12:605-609.</mixed-citation></citation-alternatives></ref><ref id="cit29"><label>29</label><citation-alternatives><mixed-citation xml:lang="ru">Lukas C, Landewe R, Sieper J, Dougados M, Davis J, Braun J, van der Linden S, van der Heijde D. Development of an ASAS-endorsed disease activity score (ASDAS) in patients with ankylosing spondylitis. Ann Rheum Dis 2009;68:18-24.</mixed-citation><mixed-citation xml:lang="en">Lukas C, Landewe R, Sieper J, Dougados M, Davis J, Braun J, van der Linden S, van der Heijde D. Development of an ASAS-endorsed disease activity score (ASDAS) in patients with ankylosing spondylitis. Ann Rheum Dis 2009;68:18-24.</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
