{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,6]],"date-time":"2026-04-06T03:58:47Z","timestamp":1775447927700,"version":"3.50.1"},"reference-count":28,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2026,4,4]],"date-time":"2026-04-04T00:00:00Z","timestamp":1775260800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCM"],"abstract":"<jats:p>Background\/Objectives: This study aimed to evaluate the femoral rotation angle (FRA) before and after THA using a single approach and to identify its influencing factors through three-dimensional measurements. Methods: This retrospective study analyzed patients undergoing 108 primary unilateral THA via the anterolateral-supine approach (ALSA) from May to October 2023. Patients with hip contractures, femoral deformities, or other specific conditions were excluded for precise FRA measurements. Preoperative and postoperative CT scans were used for measurements of the FRA, anteversion, leg lengthening, and global offset. FRA was defined as the angle between the posterior condylar line and the line connecting the bilateral anterosuperior iliac spines, with external rotation as positive. Multiple linear regression, adjusted for age, sex, body mass index, and stem design, assessed the influence of anteversion change, leg lengthening, global offset change, and soft tissue release on the difference in FRA. Results: The mean FRA changed significantly from \u22122.8\u00b0 preoperatively to \u221211.8\u00b0 postoperatively (p &lt; 0.001), demonstrating an average internal rotation of 9.0\u00b0 after THA. Anteversion increased by a mean of 9.0\u00b0 (p &lt; 0.001), leg length increased by 9.0 mm (p &lt; 0.001), and global offset decreased by 1.7 mm (p &lt; 0.001). Multivariate analysis revealed that anteversion change (\u03b2 = \u22120.41, p &lt; 0.001) and global offset change (\u03b2 = 0.40, p = 0.022) were significantly associated with FRA differences. Leg lengthening and ischiofemoral ligament or conjoint tendon resection were not significant (p = 0.089, p = 0.917, and p = 0.750, respectively). Conclusions: ALSA THA significantly rotates the femur internally, associated with an increase in anteversion and a decrease in global offset.<\/jats:p>","DOI":"10.3390\/jcm15072729","type":"journal-article","created":{"date-parts":[[2026,4,6]],"date-time":"2026-04-06T02:06:21Z","timestamp":1775441181000},"page":"2729","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Postoperative Changes in Femoral Rotation Angle and Their Influencing Factors Following Total Hip Arthroplasty via Single Approach: A Retrospective CT-Based Study"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5023-4804","authenticated-orcid":false,"given":"Hiroaki","family":"Kurishima","sequence":"first","affiliation":[{"name":"Department of Orthopaedic Surgery, Japanese Red Cross Sendai Hospital, 2-43-3 Yagiyamahoncho, Taihaku-Ku, Sendai 982-8501, Miyagi, Japan"},{"name":"Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, 1-1 Seiryo-Machi, Aoba-Ku, Sendai 980-8574, Miyagi, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4189-5245","authenticated-orcid":false,"given":"Yasutake","family":"Tomata","sequence":"additional","affiliation":[{"name":"Faculty of Health and Social Service, Kanagawa University of Human Services, 1-10-1 Heiseicho, Yokosuka 238-8522, Kanagawa, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-0166-8538","authenticated-orcid":false,"given":"Norikazu","family":"Yamada","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Japanese Red Cross Sendai Hospital, 2-43-3 Yagiyamahoncho, Taihaku-Ku, Sendai 982-8501, Miyagi, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Atsushi","family":"Noro","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Japanese Red Cross Sendai Hospital, 2-43-3 Yagiyamahoncho, Taihaku-Ku, Sendai 982-8501, Miyagi, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-8393-1056","authenticated-orcid":false,"given":"Yasuaki","family":"Kuriyama","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Japanese Red Cross Sendai Hospital, 2-43-3 Yagiyamahoncho, Taihaku-Ku, Sendai 982-8501, Miyagi, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8679-9121","authenticated-orcid":false,"given":"Hidetatsu","family":"Tanaka","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, 1-1 Seiryo-Machi, Aoba-Ku, Sendai 980-8574, Miyagi, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8225-4690","authenticated-orcid":false,"given":"Yu","family":"Mori","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, 1-1 Seiryo-Machi, Aoba-Ku, Sendai 980-8574, Miyagi, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1571-5618","authenticated-orcid":false,"given":"Toshimi","family":"Aizawa","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, 1-1 Seiryo-Machi, Aoba-Ku, Sendai 980-8574, Miyagi, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,4,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"e111","DOI":"10.1016\/S2665-9913(19)30045-1","article-title":"Risk Factors for Dislocation after Primary Total Hip Replacement: A Systematic Review and Meta-Analysis of 125 Studies Involving Approximately Five Million Hip Replacements","volume":"1","author":"Kunutsor","year":"2019","journal-title":"Lancet Rheumatol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1415","DOI":"10.1016\/j.arth.2012.11.017","article-title":"Reduced Dislocation Rates and Excellent Functional Outcomes with Large-Diameter Femoral Heads","volume":"28","author":"Stroh","year":"2013","journal-title":"J. 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