{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T05:28:04Z","timestamp":1774502884428,"version":"3.50.1"},"reference-count":28,"publisher":"BMJ","issue":"8","license":[{"start":{"date-parts":[[2020,8,12]],"date-time":"2020-08-12T00:00:00Z","timestamp":1597190400000},"content-version":"unspecified","delay-in-days":11,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"name":"Deutsche Arthrose-Hilfe e.V"},{"name":"Merian Iselin Foundation"},{"name":"the Foundation for Funding Science and Education at the Department of Surgery at the University of Basel"},{"DOI":"10.13039\/100018402","name":"Swiss Orthopaedics","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100018402","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Department of Orthopaedics and Traumatology of the University Hospital of Basel"}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Open"],"accepted":{"date-parts":[[2020,7,3]]},"published-print":{"date-parts":[[2020,8]]},"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>Reduced hip abductor strength may indirectly lead to changes in knee kinematics and functional impairment and has been reported in patients with patellofemoral pain and knee osteoarthritis (OA). Limited information is available regarding hip abductor strength following total or unicompartmental knee arthroplasty (TKA\/UKA). The aims of this systematic review are to synthesise the evidence of hip abductor muscle strength deficits in patients following TKA\/UKA and to determine influencing factors for these deficits.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods and analysis<\/jats:title>\n                    <jats:p>Embase, Medline, SportDiscus, the Web of Science Core Collection and Scopus will be searched for human-based clinical studies investigating hip abductor muscle strength after TKA\/UKA for knee OA or avascular necrosis (AVN). Articles studying hip abductor strength after knee arthroplasty for post-traumatic OA will not be considered. No restriction on study design, prosthesis design, surgical approach, patient characteristics or severity of OA\/AVN will be applied. We will search articles published between 1 January 1990 and the date of our last search. Only articles in English or German language will be considered for inclusion. Studies reporting manually measured muscle strength or measurements performed at hip abduction angles other than 0\u00b0 will be excluded. References will be screened by two reviewers independently. Where necessary, a third author will make the final decision. The assessment of quality and risk of bias will be performed with the modified Newcastle-Ottawa scale. Data will be extracted and presented in a tabular form. Depending on availability, comparable subgroup and meta-analyses will be conducted. Patient characteristics such as age, sex and surgical approach or rehabilitation programme will be analysed, if sufficient data are available.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Ethics and dissemination<\/jats:title>\n                    <jats:p>No ethics approval is required. The results will be published in a peer-reviewed journal and as conference presentation.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2020-038770","type":"journal-article","created":{"date-parts":[[2020,8,14]],"date-time":"2020-08-14T10:36:48Z","timestamp":1597401408000},"page":"e038770","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":4,"title":["Hip abductor muscle strength in patients after total or unicompartmental knee arthroplasty for knee osteoarthritis or avascular necrosis: a systematic review and meta-analysis protocol"],"prefix":"10.1136","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1623-4712","authenticated-orcid":false,"given":"Peter","family":"Kvarda","sequence":"first","affiliation":[{"name":"Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland"},{"name":"Department of Orthopaedic Surgery and Traumatology, Kantonsspital Baselland, Bruderholz, Basel-Landschaft, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Corina","family":"N\u00fcesch","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland"},{"name":"Department of Clinical Research, University of Basel, Basel, Switzerland"},{"name":"Department of Biomedical Engineering, University of Basel, Basel, Switzerland"},{"name":"Department of Spine Surgery, University Hospital of Basel, Basel, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christian","family":"Egloff","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christian","family":"Appenzeller-Herzog","sequence":"additional","affiliation":[{"name":"University Medical Library, University Library of Basel, Basel, Spiegelgasse, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Annegret","family":"M\u00fcndermann","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland"},{"name":"Department of Clinical Research, University of Basel, Basel, Switzerland"},{"name":"Department of Biomedical Engineering, University of Basel, Basel, Switzerland"},{"name":"Department of Spine Surgery, University Hospital of Basel, Basel, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Petros","family":"Ismailidis","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics and Traumatology, University Hospital Basel, Basel, Switzerland"},{"name":"Department of Biomedical Engineering, University of Basel, Basel, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2020,8,13]]},"reference":[{"key":"2025121410503406000_10.8.e038770.1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cger.2010.03.001"},{"key":"2025121410503406000_10.8.e038770.2","first-page":"646","article-title":"Burden of major musculoskeletal conditions","volume":"81","author":"Woolf","year":"2003","journal-title":"Bull World Health Organ"},{"key":"2025121410503406000_10.8.e038770.3","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(11)60752-6"},{"key":"2025121410503406000_10.8.e038770.4","first-page":"1796","article-title":"Frontal plane knee alignment: a call for standardized measurement","volume":"34","author":"Cooke","year":"2007","journal-title":"J Rheumatol"},{"key":"2025121410503406000_10.8.e038770.5","doi-asserted-by":"crossref","DOI":"10.4414\/smw.2012.13583","article-title":"Biomechanics and pathomechanisms of osteoarthritis","volume":"142","author":"Egloff","year":"2012","journal-title":"Swiss Med Wkly"},{"key":"2025121410503406000_10.8.e038770.6","doi-asserted-by":"publisher","DOI":"10.1016\/0021-9290(70)90050-3"},{"key":"2025121410503406000_10.8.e038770.7","doi-asserted-by":"publisher","DOI":"10.1002\/jor.20255"},{"key":"2025121410503406000_10.8.e038770.8","doi-asserted-by":"publisher","DOI":"10.2519\/jospt.2010.3337"},{"key":"2025121410503406000_10.8.e038770.9","unstructured":"Gandbhir VN , Rayi A . 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