BackgroundData regarding the prevalence and especially incidence of osteoporosis in Spondylarthritis (SPA) is scarce and very divergent among studies from different patient populations (1).ObjectivesIn this study, we aimed to compare demographic, disease and laboratory characteristics of SpA patients regarding their bone mineral densitometry (BMD) categories and find out incidence of osteoporosis in the follow-up BMD of patients who were not found to have osteoporosis at baseline.MethodsBetween 2010-2021, patients with a SPA diagnosis in the HUR-BIO database were searched. HUR-BIO (Hacettepe University Rheumatology Biologic Registry) is a single center biological disease modifying anti-rheumatic drug (DMARD) registry since 2010. Patients with BMD measurement were included in the study. Follow-up BMD scores were also documented. The patients were divided into 3 groups as normal, osteopenia and osteoporosis in accordance with the WHO criteria (2). Demographic characteristics, comorbidities, laboratory data and drugs in each group were documented.Results3245 patients were reviewed. BMD was measured at least once in 118 patients out of 3245 (3.6%) patients. When the groups classified, 34 patients (28.8%) were included in the normal, 49 (41.5%) osteopenia and 35 (29.7%) osteoporosis groups. Patients with normal BMD was younger than both groups. Diabetes and hypertension were more prevalent in patients with osteopenia. The BMI was significantly lower in the osteoporosis group. 25 patients with normal and osteopenia in baseline BMD measurement had at least 1 follow-up BMD measurement. During the total follow-up of 91 patient-years, 3 patients had osteoporosis, revealing a the incidence of 3.3% in 100 patient-years.ConclusionIn our study, the incidence of OP development in SPA patients was found to be 3.3%. Frequency of osteoporosis was 29.7% among SpA patients with BMD measurement (118/3245; 3.6%), however; only 40% of them had appropriate treatment. Osteoporosis seems as an overlooked and undertreated comorbidity of SpA.Table 1.Comparison of spondyloarthritis patients according to BMD scores (normal, osteopenia and osteoporosis) according to baseline BMD assessmentNORMAL Number, (%)OSTEOPENIA Number, (%)OSTEOPOROSIS Number, (%)P VALUENumber of Patients34 (28.8)49 (41.5)35(29.7)Age47,5 (27-70)63 (45-79)58 (20-75)0.00*Gender (Female)24 (70.6)34 (69.4)23 (65.7)Diabetes Mellitus3 (8.8)14 (29.2)1 (2.9)0.00*Hypertension11 (32.4)28 (58.3)5 (14.3)0.00*Chronic Renal Failure2 (6.9)1 (2.7)1 (5.3)0.81Chronic Ostructive Pulmonary Disease4 (13.8)4 (10.8)1 (5.3)0.30Coronary Artery Disease0 (0)5 (12.5)3 (15)0.27Malignancy1 (3.6)1 (2.9)1 (4.2)1.0Smoking21 (61.8)23 (47.9)21 (63.6)0.379 (26.5)13 (27.1)5 (15.2)4 (11.8)12 (25)7 (21.2)Calcium mg/dl9.4 (8.2-10.2)9.5 (8.7-10.4)9.7 (8.1-10.4)0.49Phosphorus mg/dl3.5 (3-4.4)3.4 (2.6-5)3.8 (2.9-4.9)0.25Vitamin D ng/ml16 (7.4-64.4)21.2 (5-69.6)15.8 (5.8-49.1)0.66ALP IU/ml89.5 (54-137)89.5(53-169)80 (50-239)0.43Albumin g/dl4.2 (1.7-4.7)4.2 (3.3-8.4)4.2 (2-4.8)0.43TSH mU/ml1.5 (0.8-4.1)2.3 (0.1-9.7)2 (0.7-3.3)0.71Body Mass Index (BMI) kg/m229 (17-41.2)28.3 (20-44.6)25.1(15.8-43.2)0,06*Steroids4 (11.8)8 (16.3)2 (5.7)0.33Anti-TNF25 (73.5)35 (71.4)26 (74.3)0,95D Vitamin7 (20.6)14 (28.6)10 (28.6)0.67Calcium4 (11.8)5 (10.2)6 (17.1)0.63Bisphosphonate0 (0)4 (8.2)14 (40)0,00*Data was represented as median (minimum-maximum) or n(%)References[1]Hu LY, Chen PM, Shen CC, et all. Should clinicians pay more attention to the potential underdiagnosis of osteoporosis in patients with ankylosing spondylitis? A national population-based study in Taiwan. PoleS one 2019:6;14[2]Kanis JA on behalf of the World Health Organization Scientific Group (2007) Assessment of osteoporosis at the primary health-care level. Technical Report. World Health Organization Collaborating Centre for Metabolic Bone Diseases, University of Sheffield, UK. 2007: Printed by the University of Sheffield.Disclosure of InterestsNone declared
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