{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T01:13:02Z","timestamp":1785460382571,"version":"3.56.0"},"reference-count":33,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2025,5,12]],"date-time":"2025-05-12T00:00:00Z","timestamp":1747008000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J of Clinical Ultrasound"],"published-print":{"date-parts":[[2025,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>Postpartum low back pain (PLBP) is a prevalent condition linked to core muscle dysfunction. This study aimed to evaluate morphological and functional changes in core muscles using musculoskeletal ultrasound and explore their association with PLBP in postpartum women.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>A retrospective cross\u2010sectional study included 105 women (35 PLBP group, 35 postpartum non\u2010PLBP group, and 35 non\u2010pregnant without LBP group). We assessed pain intensity and functional impairment, measured multifidus and abdominal muscle thickness by ultrasound, and assessed core stability using a unilateral hip bridge test.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The PLBP group showed significantly reduced multifidus muscle thickness (resting and maximum contraction) versus both control groups (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05), though contraction capacity only differed from non\u2010pregnant controls (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). Abdominal muscles (internal oblique, upper rectus abdominis, transversus abdominis) exhibited significantly decreased thickness and relaxation capacity compared to non\u2010pregnant controls (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05), but not versus postpartum non\u2010PLBP group (<jats:italic>p<\/jats:italic>\u2009&gt;\u20090.05). Core stability was significantly lower in the PLBP group than in both controls (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05), while waist circumference was larger than in non\u2010pregnant controls only (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). Logistic regression confirmed reduced core stability (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05) and increased waist circumference as independent PLBP risk factors.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>Core muscle atrophy and functional impairment are critical pathological mechanisms underlying PLBP, necessitating targeted interventions.<\/jats:p><\/jats:sec>","DOI":"10.1002\/jcu.24063","type":"journal-article","created":{"date-parts":[[2025,5,12]],"date-time":"2025-05-12T04:56:49Z","timestamp":1747025809000},"page":"1731-1740","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Morphological and Functional Changes of Core Muscles in Postpartum Women With Low Back Pain Based on Musculoskeletal Ultrasound"],"prefix":"10.1002","volume":"53","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-0334-7135","authenticated-orcid":false,"given":"Yue","family":"Long","sequence":"first","affiliation":[{"name":"Department of Rehabilitation Medicine HuiYa Hospital of The First Affiliated Hospital, Sun Yat\u2010sen University  Huizhou Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"QiuHuan","family":"Qiu","sequence":"additional","affiliation":[{"name":"Department of Rehabilitation Medicine HuiYa Hospital of The First Affiliated Hospital, Sun Yat\u2010sen University  Huizhou Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"XiaoPing","family":"Zhao","sequence":"additional","affiliation":[{"name":"Department of Ultrasound HuiYa Hospital of The First Affiliated Hospital, Sun Yat\u2010sen University  Huizhou Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,5,12]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.3390\/jcm14030719"},{"key":"e_1_2_10_3_1","first-page":"84","article-title":"Diastasis of Rectus Abdominis Muscles: Patterns of Anatomical Variation as Demonstrated by Ultrasound. 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