THU0491 RELIABILITY AND VALIDITY OF THE İSTANBUL LOW BACK PAIN DISABILITY INDEX IN LUMBAR RADICULOPATHY
Authors: Savaş Sencan, Didem Erdem, Serhad Bilim, Mehmet Tuncay Duruöz
Journal: Annals of the Rheumatic Diseases (2019)

<h3>Background:</h3> The Istanbul Low Back Pain Disability Index (ILBPDI) was developed to assess the disability in patients with mechanical low back pain with 18 daily activities questions (1). <h3>Objectives:</h3> The aim of this study is to investigate the validity and reliability of the İstanbul Low Back Pain Disability Index in lumbar radiculopathy. <h3>Methods:</h3> Patients who were diagnosed with radiculopathy due to lumbar spinal stenosis and/or disc herniation by physical examination and imaging methods were included in the study. Data about age, sex, body mass index (BMI), disease duration (month) were noted. Short Form 36 (SF-36) was used to assess the quality of life. Disability due to low back pain was assessed with Oswestry Low Back Disability Questionnaire. The severity of low back pain and extremity pain due to radiculopathy were assessed on the Visual Analogue Scale (VAS). The reliability of ILBPDI was determined by internal consistency (Cronbach's alpha coefficient). The construct validity (convergent and divergent validities) was evaluated. The correlations of the ILBPDI with SF-36, Oswestry Low Back Disability Questionnaire, and the VAS scores of the low back pain and radiculopathy were assessed for convergent validity. The relations of the ILBPDI with age, BMI, and disease duration were assessed for divergent validity. The construct validity of the ILBPDI scale was determined by Spearman's correlation coefficient. The descriptive analysis was done for demographic data. P&lt;0.05 accepted as significant. SPSS 20.0 (Statistical package for social sciences for Windows 20.0) program was used for the statistical analysis. <h3>Results:</h3> The mean age of 82 patients (44 female, 38 male) with lumbar radiculopathy was 45.45 (SD: 11.96) years. The median (min-max) duration of disease was 5 (1-120) months. The mean BMI of patients was 29.09 (SD: 5.04). The mean score of ILBPDI was 30.73 (SD: 17.04) ant the mean score of Oswestry Low Back Disability Questionnaire was 52.73 (SD: 16.98). The Cronbach's alpha coefficient of the ILBPDI for internal consistency was 0.764. The ILBPDI score had moderate and significant positive correlations with Oswestry Low Back Disability Questionnaire (rho: 0.610, p&lt;0.005). Statistically significant but low correlation was detected between ILBPDI and the VAS score of radiculopathy (rho: 0.285, p: 0.010), but there was no correlation with the VAS score of low back pain (p&gt;0.05). As for the correlations between the ILBPDI total score and SF-36 subgroups, significant negative correlations were detected with physical functioning (rho: -0.672, p&lt;0.005), physical role limitation (rho: -0.230, p: 0.038), bodily pain (rho: -0.546, p&lt;0.005), general health (rho: -0.262, p: 0.017), and social function (rho: -0.337, p&lt;0.005) subgroups of the SF-36. There were no significant correlations between ILBPDI and age, disease duration, and BMI (p&gt;0.05). <h3>Conclusion:</h3> The Istanbul Low Back Pain Disability Index is a valid and reliable instrument in patients with lumbar radiculopathy. This is a preliminary study. The study will continue for the factor analysis. <h3>Reference:</h3> [1] Duruoz MT et al. Development and validation of a functional disability index for chronic low back pain. J Back Musculoskelet Rehabil. 2013; 26: 45-54. <h3>Disclosure of Interests:</h3> Savaş Sencan: None declared, Didem Erdem: None declared, Serhad Bilim: None declared, Mehmet Tuncay Duruöz Grant/research support from: Abvie, Speakers bureau: Novartis, AMGEN, Abdi İbrahim, İlko