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Correlation between clinical outcome and spinopelvic parameters in ankylosing spondylitis

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Abstract

Purpose

Little data are available on the relationship between sagittal spinopelvic parameters and health related quality of life (HRQOL) in ankylosing spondylitis (AS) patients. The aim of this study was to identify the relationships between spinopelvic parameters and HRQOL in AS.

Methods

The study and control groups comprised 107 AS patients and 40 controls. All underwent anteroposterior and lateral radiographs of the whole spine including hip joints and completed clinical questionnaires. The radiographic parameters examined were sacral slope, pelvic tilt, pelvic incidence, thoracic kyphosis, lumbar lordosis, and sagittal vertical axis. A Visual Analogue Scale (VAS: 0–10) score for back pain, the Oswestry disability index (ODI) questionnaire, Scoliosis Research Society (SRS-22) questionnaire and Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) were administered to evaluate QOL. Statistical analysis was performed to identify significant differences between the study and control groups. In addition, correlations between radiological parameters and clinical questionnaires were sought.

Results

The AS patients and controls were found to be significantly different in terms of sagittal vertical axis, sacral slope, pelvic tilt, pelvic incidence, and lumbar lordosis. However, no significant intergroup difference was observed for thoracic kyphosis (P > 0.05). Of the 107 AS patients, there were 18 women and 89 men. Correlation analysis revealed significant relationships between radiographic parameters and clinical outcomes. Multiple regression analysis was performed to identify predictors of clinical outcome, and the results obtained revealed that sagittal vertical axis and sacral slope significantly predicted VAS, ODI and BASDAI scores and that sagittal vertical axis and lumbar lordosis predicted SRS-22 scores.

Conclusions

AS patients and normal controls were found to be significantly different in terms of sagittal spinopelvic parameters. Correlation analysis revealed significant relationships between radiographic parameters and clinical outcomes. In particular, sagittal vertical axis, sacral slope and lumbar lordosis were found to be significant parameters in prediction of clinical outcomes in AS patient.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Medical Research Institute, Pusan National University School of Medicine, 1-10 Ami-Dong, Seo-Gu, Busan, 602-739, Republic of Korea

    Jong Ki Shin, Jung Sub Lee, Tae Sik Goh & Seung Min Son

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  1. Jong Ki Shin
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  2. Jung Sub Lee
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  3. Tae Sik Goh
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  4. Seung Min Son
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Correspondence to Jung Sub Lee.

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Shin, J.K., Lee, J.S., Goh, T.S. et al. Correlation between clinical outcome and spinopelvic parameters in ankylosing spondylitis. Eur Spine J 23, 242–247 (2014). https://doi.org/10.1007/s00586-013-2929-8

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  • DOI: https://doi.org/10.1007/s00586-013-2929-8

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