Abstract
This study uses data from a previously published randomised trial where balloon kyphoplasty was compared to non-surgical management. Of the improved overall quality of life, 60 % was caused by decreased pain. However, ignoring other dimensions of quality of life would underestimate the procedure's effect. Acute back pain has been viewed as the most important factor lowering quality of life (QoL) for patients suffering vertebral fractures. The objective of this study was to quantify the impact of different health dimensions on overall QoL using patient-reported outcome measurements (PROMs) collected in Fracture Reduction Evaluation (FREE) trial. The analysis was based on patients included in the 2-year-long randomised controlled FREE trial studying the efficacy and safety of balloon kyphoplasty procedure (BKP) compared to non-surgical management (NSM). The PROMs included were EQ-5D, Short Form (SF)-36, visual analogue scale (VAS) pain and the Roland-Morris Disability Questionnaire (RMDQ). The health dimensional contribution to the overall QoL improvements was analysed by isolating the impact of each dimension on QoL in the SF-36 and EQ-5D, respectively. A correlation analysis of the QoL improvement was performed to investigate the relationships between the four instruments. Changes in pain explained 60 % of the quality-adjusted life years (QALY) gained in BKP vs. NSM followed by self-care (17 %), mobility (16 %) and usual activities (10 %) (EQ-5D). Health dimensions capturing the mental state had little impact on the QALY gained. The SF-36 dimensional analysis showed similar results. The correlation analysis showed that the correlation between VAS pain, RMDQ and QALY improvement was fairly weak. Changes in the pain dimension of health are the most important drivers for changes of overall QoL in patients treated with BKP or NSM. However, ignoring the impact of other dimensions would lead to an underestimation of the actual improvement in overall QoL.
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