{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T17:01:12Z","timestamp":1786122072000,"version":"build-2736575974"},"reference-count":12,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T00:00:00Z","timestamp":1786060800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Clin. Med.","JCM"],"abstract":"<jats:p>Background\/Objectives: Hip ultrasound is the standard screening method for developmental dysplasia of the hip (DDH) in infants, yet sonographic acetabular rim irregularities (SARIs) remain understudied regarding their prevalence and clinical associations. Methods: A total of 1010 infants within the first four months of life, referred to a specialized pediatric orthopedic hip clinic between 2014 and 2019 for suspected or confirmed DDH, were included in this retrospective cohort study. Hip ultrasound was performed using the standardized Graf technique. Clinical, demographic, and sonographic data were extracted from patient records. Two pediatric orthopedic specialists assessed all ultrasound hip images for the presence of an SARI and measured its relative size (d\/D). Associations among SARI, patient characteristics, and sonographic parameters were analyzed using appropriate univariate and multivariable statistical methods (p &lt; 0.05). Results: We identified SARI in 9.11% of all hips and in 13.07% of all infants, with many developing during Pavlik harness treatment. Univariate and multivariate analyses revealed cesarean delivery as an independent factor associated with SARI occurrence. SARIs that developed over time had a significantly larger d\/D ratio compared with those that were visible from the very beginning (p = 0.04). Conclusions: These findings establish a baseline prevalence and highlight potential risk markers for SARI in a dysplasia-enriched cohort. Further prospective studies are warranted to elucidate the clinical significance of SARI and its impact on treatment outcomes and hip development.<\/jats:p>","DOI":"10.3390\/jcm15166136","type":"journal-article","created":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T08:01:36Z","timestamp":1786089696000},"page":"6136","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Prevalence and Risk Factors for Acetabular Rim Irregularities in Infants with Hip Dysplasia: A Cohort Study"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9509-8244","authenticated-orcid":false,"given":"Matthias","family":"Pallamar","sequence":"first","affiliation":[{"name":"Department of Pediatric Orthopaedics and Foot Surgery, Orthopaedic Hospital Speising, Speisinger Stra\u00dfe 109, 1130 Vienna, Austria"},{"name":"Medical Campus, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-6241-2622","authenticated-orcid":false,"given":"Philipp","family":"Scheider","sequence":"additional","affiliation":[{"name":"Department of Pediatric Orthopaedics and Foot Surgery, Orthopaedic Hospital Speising, Speisinger Stra\u00dfe 109, 1130 Vienna, Austria"},{"name":"Medical Campus, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carina","family":"Wei\u00df","sequence":"additional","affiliation":[{"name":"Department of Pediatric Orthopaedics and Foot Surgery, Orthopaedic Hospital Speising, Speisinger Stra\u00dfe 109, 1130 Vienna, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Florentin","family":"Spalt","sequence":"additional","affiliation":[{"name":"Herz-Jesu-Hospital, Baumgasse 20A, 1030 Vienna, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0634-4352","authenticated-orcid":false,"given":"Gudrun H.","family":"Borchert","sequence":"additional","affiliation":[{"name":"Dr. Borchert Medical Information Management, Egelsbacher Str. 39e, 63225 Langen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Catharina","family":"Chiari","sequence":"additional","affiliation":[{"name":"Department of Pediatric Orthopaedics and Foot Surgery, Orthopaedic Hospital Speising, Speisinger Stra\u00dfe 109, 1130 Vienna, Austria"},{"name":"Medical Campus, Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"248","DOI":"10.1007\/BF00436138","article-title":"Classification of Hip Joint Dysplasia by Means of Sonography","volume":"102","author":"Graf","year":"1984","journal-title":"Arch. Orthop. Trauma. Surg."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"837","DOI":"10.2214\/ajr.155.4.2119119","article-title":"Performing Dynamic Sonography of the Infant Hip","volume":"155","author":"Harcke","year":"1990","journal-title":"Am. J. Roentgenol."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"673","DOI":"10.1148\/radiology.157.3.3903854","article-title":"The Infant Hip: Real-Time US Assessment of Acetabular Development","volume":"157","author":"Morin","year":"1985","journal-title":"Radiology"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"767","DOI":"10.1302\/0301-620X.71B5.2684989","article-title":"Ultrasound for Hip Assessment in the Newborn","volume":"71","author":"Terjesen","year":"1989","journal-title":"J. Bone Jt. Surg. Br. 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Reprod. Biol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"984","DOI":"10.1302\/0301-620X.87B7.16073","article-title":"Elective Caesarean Section Is Associated with a Reduction in Developmental Dysplasia of the Hip in Term Breech Infants","volume":"87-B","author":"Lowry","year":"2005","journal-title":"J. Bone Jt. Surg. Br. Vol."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1399","DOI":"10.1302\/0301-620X.100B10.BJJ-2017-1539.R2","article-title":"Results of Universal Ultrasound Screening for Developmental Dysplasia of the Hip: A Prospective Follow-up of 28 092 Consecutive Infants","volume":"100-B","author":"Biedermann","year":"2018","journal-title":"Bone Jt. 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