{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T18:27:39Z","timestamp":1793039259505,"version":"4.5.0"},"reference-count":37,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2022,6,6]],"date-time":"2022-06-06T00:00:00Z","timestamp":1654473600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2022,6,6]],"date-time":"2022-06-06T00:00:00Z","timestamp":1654473600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2022,6,6]],"date-time":"2022-06-06T00:00:00Z","timestamp":1654473600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100002839","name":"Charit\u00e9 \u2013 Universit\u00e4tsmedizin Berlin","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100002839","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100018842","name":"Deutsche Arthrose-Hilfe e.V.","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100018842","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Dr. Melitta Berkemann Stiftung"},{"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":["Knee surg. sports traumatol. arthrosc."],"published-print":{"date-parts":[[2023,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>Varus or valgus deformities in knee osteoarthritis may have a crucial impact on ankle subtalar range of motion (ROM) and ligamentous stability. The purpose of this study was to assess whether the grade of ankle eversion and inversion rotation stability was influenced by frontal deformities of the knee joint.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Patients who were planned to undergo total knee arthroplasty (TKA) were prospectively included in this study. Patients were examined radiologically (mechanical tibiofemoral angle (mTFA), hindfoot alignment view angle (HAVA), anterior distal tibia angle (ADTA)) and clinically (ROM of the knee and ankle joint, foot function index, knee osteoarthritis outcome score). Ankle stability was assessed using an ankle arthrometer (AA) to test inversion\/eversion (ie) rotation and anterior\/posterior (ap) displacement stability of the ankle joint. Correlations were calculated using Pearson\u2019s coefficient, and differences between two independent groups of nonparametric data were calculated using a two\u2010sided Wilcoxon signed rank test.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Eighty\u2010two (varus <jats:italic>n\u2009=\u2009<\/jats:italic>52, valgus <jats:italic>n\u2009=\u2009<\/jats:italic>30) patients were included. The preoperative mTFA significantly correlated with the HAVA (Pearson\u2019s correlation<jats:italic>\u2009=\u2009<\/jats:italic>\u2212 0.72, <jats:italic>p\u2009&lt;\u2009<\/jats:italic>0.001). Laxity testing of the ankle demonstrated that in both varus and valgus knee osteoarthritis, higher grades of mTFA did not correlate with the inversion or eversion capacity of the ankle joint. The ADTA significantly correlated with the posterior displacement of the ankle joint (cor\u2009=\u20090.24, <jats:italic>p\u2009=\u2009<\/jats:italic>0.049).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This study could not confirm that higher degrees of frontal knee deformities in osteoarthritis were associated with increasing grades of ligamentous ankle instabilities or a reduced ROM of the subtalar joint.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>II.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-022-07021-3","type":"journal-article","created":{"date-parts":[[2022,6,6]],"date-time":"2022-06-06T08:03:56Z","timestamp":1654502636000},"page":"1704-1713","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Increasing grades of frontal deformities in knee osteoarthritis are not associated with ligamentous ankle instabilities"],"prefix":"10.1002","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0435-9059","authenticated-orcid":false,"given":"F.","family":"Graef","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Center for Musculoskeletal Surgery Charit\u00e9 \u2013 Universit\u00e4tsmedizin Berlin, corporate member of Freie Universit\u00e4t Berlin and Humboldt\u2010Universit\u00e4t zu Berlin Charit\u00e9platz 1 10117 Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"R\u00fchling","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Center for Musculoskeletal Surgery Charit\u00e9 \u2013 Universit\u00e4tsmedizin Berlin, corporate member of Freie Universit\u00e4t Berlin and Humboldt\u2010Universit\u00e4t zu Berlin Charit\u00e9platz 1 10117 Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"Gwinner","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Center for Musculoskeletal Surgery Charit\u00e9 \u2013 Universit\u00e4tsmedizin Berlin, corporate member of Freie Universit\u00e4t Berlin and Humboldt\u2010Universit\u00e4t zu Berlin Charit\u00e9platz 1 10117 Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H.","family":"Hommel","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> Department of Orthopaedics M\u00e4rkisch\u2010Oderland Hospital, Brandenburg Medical School Theodor Fontane Wriezen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Tsitsilonis","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Center for Musculoskeletal Surgery Charit\u00e9 \u2013 Universit\u00e4tsmedizin Berlin, corporate member of Freie Universit\u00e4t Berlin and Humboldt\u2010Universit\u00e4t zu Berlin Charit\u00e9platz 1 10117 Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"Perka","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Center for Musculoskeletal Surgery Charit\u00e9 \u2013 Universit\u00e4tsmedizin Berlin, corporate member of Freie Universit\u00e4t Berlin and Humboldt\u2010Universit\u00e4t zu Berlin Charit\u00e9platz 1 10117 Berlin 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