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Exclusion criteria included pre-existing spinal disorders, major trauma, systemic conditions affecting recovery, or radicular symptoms. Disability was quantified using total temporary incapacity (TTI), absolute incapacity (AI), and follow-up (FU) durations. Paraspinal muscle morphology was assessed at the L4\u2013L5 level using cross-sectional area (CSA) and fatty infiltration grading with Goutallier, Mercuri, and Kader scales. Associations were tested using\n                      <jats:italic>t<\/jats:italic>\n                      -tests, ANOVA, and chi-square, with significance set at\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      A total of 87 patients (77.0% male; mean age, 36.4\u2009\u00b1\u200914.9\u00a0years) were included. The mean TTI was 30.2\u2009\u00b1\u200921.9\u00a0days. No significant associations were found between CSA or most morphological scores and disability duration. Only higher Goutallier scores in the multifidus muscle were weakly associated with longer follow-up (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.037). A modest correlation was observed between psoas CSA and follow-up\/TTI duration (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Paravertebral muscle atrophy, as assessed by MRI, does not appear to significantly influence short-term disability in acute work-related LBP. These findings suggest that muscle morphology plays a minor role in acute LBP recovery, contrasting with its known impact in chronic cases.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00256-025-04989-0","type":"journal-article","created":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T04:13:32Z","timestamp":1753848812000},"page":"63-70","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Impact of paravertebral muscular atrophy in acute work-related low back pain: a retrospective cohort study"],"prefix":"10.1007","volume":"55","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-1933-6079","authenticated-orcid":false,"given":"Rita Portela","family":"Resende","sequence":"first","affiliation":[]},{"given":"In\u00eas","family":"Martinho","sequence":"additional","affiliation":[]},{"given":"Alberto","family":"Vieira","sequence":"additional","affiliation":[]},{"given":"Catarina","family":"Vieira","sequence":"additional","affiliation":[]},{"given":"Nuno","family":"Neves","sequence":"additional","affiliation":[]},{"given":"Manuel Ribeiro","family":"da Silva","sequence":"additional","affiliation":[]},{"given":"Daniela","family":"Linhares","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2025,7,30]]},"reference":[{"issue":"6","key":"4989_CR1","doi-asserted-by":"publisher","first-page":"299","DOI":"10.21037\/atm.2020.02.175","volume":"8","author":"A Wu","year":"2020","unstructured":"Wu A, March L, Zheng X, Huang J, Wang X, Zhao J, et al. 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All procedures involving human participants were performed in compliance with relevant national and institutional ethical standards and guidelines. Written informed consent was obtained from all patients included in the study, authorizing the use of their clinical and imaging data for research purposes. This consent was collected at the time of admission, as part of the routine protocol in the management of work-related injuries. All methods were carried out in accordance with applicable regulations, and patient confidentiality was preserved throughout data collection, analysis, and publication.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"All authors declare no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}}]}}