{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,31]],"date-time":"2026-10-31T03:34:56Z","timestamp":1793417696462,"version":"4.5.0"},"reference-count":35,"publisher":"Springer Science and Business Media LLC","issue":"10","license":[{"start":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T00:00:00Z","timestamp":1633910400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T00:00:00Z","timestamp":1633910400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100002839","name":"Charit\u00e9 - Universit\u00e4tsmedizin Berlin","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100002839","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Arch Orthop Trauma Surg"],"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n                <jats:title>Introduction<\/jats:title>\n                <jats:p>Spinopelvic mobility was identified as a contributing factor for total hip arthroplasty (THA) instability. The influence of spinopelvic function on acetabular cup positioning has not yet been sufficiently investigated in a prospective setting. Therefore, our study aimed (1) to assess cup inclination and anteversion in standing and sitting based on spinopelvic mobility, (2) to identify correlations between cup position and spinopelvic function, (3) and to determine the influence of the individual spinal segments, spinal sagittal balance, and spinopelvic characteristics on the mobility groups.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Materials and methods<\/jats:title>\n                <jats:p>A prospective study assessing 197 THA patients was conducted with stereoradiography in standing and sitting position postoperatively. Two independent investigators determined cup anteversion and inclination, C7-Sagittal vertical axis, cervical lordosis (CL), thoracic kyphosis (TK), lumbar lordosis (LL), sacral slope, pelvic tilt (PT), anteinclination (AI), and pelvic femoral angle (PFA). Spinopelvic mobility is defined based on \u2206PT\u2009=\u2009PT<jats:sub>standing<\/jats:sub>\u2009\u2212\u2009PT<jats:sub>sitting<\/jats:sub> as \u2206PT\u2009&lt;\u200910\u00b0 stiff, \u2206PT\u2009\u2265\u200910\u201330\u00b0 normal, and \u2206PT\u2009&gt;\u200930\u00b0 hypermobile. Pearson coefficient represented correlations between the cup position and spinopelvic parameters.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Significant differences were demonstrated for cup anteversion (stiff\/hypermobile 29.3\u00b0\/40.1\u00b0; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.000) and inclination (stiff\/hypermobile 43.5\u00b0\/60.2\u00b0; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.000) in sitting, but not in standing position. \u2206 (standing\/sitting) of the cup anteversion (stiff\/neutral\/hypermobile 5.8\u00b0\/12.4\u00b0\/19.9\u00b0; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.000) and inclination (stiff\/neutral\/hypermobile 2.3\u00b0\/11.2\u00b0\/18.8\u00b0; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.000) revealed significant differences between the mobility groups. The acetabular cup position in sitting, was correlated with lumbar flexibility (\u2206LL) and spinopelvic mobility. Significant differences were detected between the mobility types and acetabular orientation (AI sit:stiff\/hypermobile 47.6\u00b0\/65.4\u00b0; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.000) and hip motion (\u2206PFA:stiff\/hypermobile 65.8\u00b0\/37.3\u00b0; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.000). Assessment of the spinal segments highlighted the role of lumbar flexibility (\u2206LL:stiff\/hypermobile 9.9\u00b0\/36.2\u00b0; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.000) in the spinopelvic complex.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>The significantly different acetabular cup positions in sitting and in the \u2206 between standing and sitting and the significantly altered spinopelvic characteristics in terms of stiff and hypermobile spinopelvic mobility underlined the consideration for preoperative functional radiological assessment. Identifying the patients with altered spinopelvic mechanics due to a standardized screening algorithm is necessary to provide safe acetabular cup positioning. The proximal spinal segments appeared not to be involved in the spinopelvic function.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00402-021-04196-1","type":"journal-article","created":{"date-parts":[[2021,10,11]],"date-time":"2021-10-11T08:07:59Z","timestamp":1633939679000},"page":"2979-2989","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Acetabular cup position differs in spinopelvic mobility types: a prospective observational study of primary total hip arthroplasty patients"],"prefix":"10.1007","volume":"142","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5614-5431","authenticated-orcid":false,"given":"Henryk","family":"Haffer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhen","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhouyang","family":"Hu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian","family":"Hipfl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthias","family":"Pumberger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,10,11]]},"reference":[{"issue":"1","key":"4196_CR1","doi-asserted-by":"publisher","first-page":"128","DOI":"10.2106\/JBJS.H.00155","volume":"91","author":"KJ Bozic","year":"2009","unstructured":"Bozic KJ, Kurtz SM, Lau E, Ong K, Vail TP, Berry DJ (2009) The epidemiology of revision total hip arthroplasty in the United States. 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The authors have no conflicts of interest to declare that are relevant to the content of this article. All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript. The authors have no financial or proprietary interests in any material discussed in this article.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the institutional review board of Charit\u00e9-Universit\u00e4tsmedizin Berlin under the registration number EA2\/142\/17.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval"}},{"value":"Informed consent was obtained from all individual participants included in the study.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}}]}}