{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T17:17:48Z","timestamp":1788283068413,"version":"build-2803163510"},"reference-count":10,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2019,6]]},"abstract":"<jats:sec><jats:title>OBJECTIVE<\/jats:title><jats:p>It is now well accepted that spinopelvic parameters are correlated with clinical outcomes in adult spinal deformity (ASD). The purpose of this study was to determine whether obtaining optimal spinopelvic alignment was absolutely necessary to achieve a minimum clinically important difference (MCID) or substantial clinical benefit (SCB).<\/jats:p><\/jats:sec><jats:sec><jats:title>METHODS<\/jats:title><jats:p>A multicenter retrospective review of patients who underwent less-invasive surgery for ASD was conducted. Inclusion criteria were age \u2265 18 years and one of the following: coronal Cobb angle &gt; 20\u00b0, sagittal vertical axis (SVA) &gt; 5 cm, pelvic tilt (PT) &gt; 20\u00b0, or pelvic incidence to lumbar lordosis (PI-LL) mismatch &gt; 10\u00b0. A total of 223 patients who were treated with circumferential minimally invasive surgery or hybrid surgery and had a minimum 2-year follow-up were identified. Based on optimal spinopelvic parameters (PI-LL mismatch \u00b1 10\u00b0 and SVA &lt; 5 cm), patients were divided into aligned (AL) or malaligned (MAL) groups. The primary clinical outcome studied was the Oswestry Disability Index (ODI) score.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>There were 74 patients in the AL group and 149 patients in the MAL group. Age and body mass index were similar between groups. Although the baseline SVA was similar, PI-LL mismatch (9.9\u00b0 vs 17.7\u00b0, p = 0.002) and PT (19\u00b0 vs 24.7\u00b0, p = 0.001) significantly differed between AL and MAL groups, respectively. As expected postoperatively, the AL and MAL groups differed significantly in PI-LL mismatch (\u22120.9\u00b0 vs 13.1\u00b0, p &lt; 0.001), PT (14\u00b0 vs 25.5\u00b0, p = 0.001), and SVA (11.8 mm vs 48.3 mm, p &lt; 0.001), respectively. Notably, there was no difference in the proportion of AL or MAL patients in whom an MCID (52.75% vs 61.1%, p &gt; 0.05) or SCB (40.5% vs 46.3%, p &gt; 0.05) was achieved for ODI score, respectively. Similarly, no differences in percentage of patients obtaining an MCID or SCB for visual analog scale back and leg pain score were observed. On multivariate analysis controlling for surgical and preoperative demographic differences, achieving optimal spinopelvic parameters was not associated with achieving an MCID (OR 0.645, 95% CI 0.31\u20131.33) or an SCB (OR 0.644, 95% CI 0.31\u20131.35) for ODI score.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSIONS<\/jats:title><jats:p>Achieving optimal spinopelvic parameters was not a predictor for achieving an MCID or SCB. Since spinopelvic parameters are correlated with clinical outcomes, the authors\u2019 findings suggest that the presently accepted optimal spinopelvic parameters may require modification. Other factors, such as improvement in neurological symptoms and\/or segmental instability, also likely impacted the clinical outcomes.<\/jats:p><\/jats:sec>","DOI":"10.3171\/2018.11.spine181261","type":"journal-article","created":{"date-parts":[[2019,2,27]],"date-time":"2019-02-27T01:12:12Z","timestamp":1551229932000},"page":"833-838","source":"Crossref","is-referenced-by-count":5,"title":["Is achieving optimal spinopelvic parameters necessary to obtain substantial clinical benefit? 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