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The TT\u2013TG was measured on axial computed tomography (CT) images. Femora width and tibial width were selected to represent knee size. The correlation of TT\u2013TG and gender, body height, femora width, and tibial width was evaluated. The height\u2010related pathologic threshold of increased TT\u2013TG was produced according to Dejour\u2019s method. To combine TT\u2013TG with body height and knee size, three new indexes were introduced, ratio of TT\u2013TG to body height (RTH), ratio of TT\u2013TG to femoral width (RTF), and ratio of TT\u2013TG to tibial width (RTT). The ability to predict patellar instability was assessed by the receiver\u2010operating characteristic (ROC) curve, odds ratios (ORs), sensitivity, and specificity.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In patients with patellar instability, TT\u2013TG showed significantly correlation with patient height, femoral width, and tibial width respectively (range <jats:italic>r<\/jats:italic>\u2009=\u20090.266\u20130.283). This correlation was not found in the control group. The pathologic threshold of TT\u2013TG was 18\u00a0mm in patients\u2009&lt;\u2009169\u00a0cm (53%), and the mean TT\u2013TG was 21\u00a0mm in patients\u2009\u2265\u2009169\u00a0cm (54%). There was significant difference in RTH, RTF, and RTT between the two groups. RTH, RTF and RTT have similar large area under the curve (AUC) with TT\u2013TG.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>TT\u2013TG showed significant correlation with body height and knee size, respectively. The pathologic threshold of increased TT\u2013TG was suggested to be 21\u00a0mm for patients <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/ksabf08034-math-0001.png\" xlink:title=\"urn:x-wiley:09422056:media:ksabf08034:ksabf08034-math-0001\"\/> 169\u00a0cm and 18\u00a0mm for patients <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/ksabf08034-math-0003.png\" xlink:title=\"urn:x-wiley:09422056:media:ksabf08034:ksabf08034-math-0003\"\/> 169\u00a0cm. Body height\u2010related pathologic threshold provided a supplement for indications of tibial tuberosity medialization.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>IV.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-022-06992-7","type":"journal-article","created":{"date-parts":[[2022,5,17]],"date-time":"2022-05-17T04:03:34Z","timestamp":1652760214000},"page":"3760-3766","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Higher pathologic threshold of increased tibial tuberosity\u2013trochlear groove distance should be considered for taller patients"],"prefix":"10.1002","volume":"30","author":[{"given":"Hai\u2010Jun","family":"Wang","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Department, Beijing Key Laboratory of Sports Injuries Peking University Third Hospital No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"},{"name":"<!--<label>4<\/label>--> Peking University Institute of Sports Medicine No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi\u2010Fan","family":"Song","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Department, Beijing Key Laboratory of Sports Injuries Peking University Third Hospital No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"},{"name":"<!--<label>4<\/label>--> Peking University Institute of Sports Medicine No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong","family":"Ma","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Department, Beijing Key Laboratory of Sports Injuries Peking University Third Hospital No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"},{"name":"<!--<label>4<\/label>--> Peking University Institute of Sports Medicine No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin","family":"Lin","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Department, Beijing Key Laboratory of Sports Injuries Peking University Third Hospital No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"},{"name":"<!--<label>4<\/label>--> Peking University Institute of Sports Medicine No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian","family":"Wang","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Department, Beijing Key Laboratory of Sports Injuries Peking University Third Hospital No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"},{"name":"<!--<label>4<\/label>--> Peking University Institute of Sports Medicine No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong\u2010Jian","family":"Wang","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Department, Beijing Key Laboratory of Sports Injuries Peking University Third Hospital No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"},{"name":"<!--<label>4<\/label>--> Peking University Institute of Sports Medicine No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Liu","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Sports Medicine Department, Beijing Key Laboratory of Sports Injuries Peking University Third Hospital No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"},{"name":"<!--<label>4<\/label>--> Peking University Institute of Sports Medicine No. 49 North Garden Road, Haidian 100191 Beijing People\u2019s Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Lu","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> Department of Sports Medicine, First Affiliated Hospital Shenzhen University 518000 Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fei","family":"Wang","sequence":"additional","affiliation":[{"name":"<!--<label>3<\/label>--> Department of Joint Surgery Hebei Medical University, Third Affiliated Hospital No.139 Ziqiang Road 050000 Shijiazhuang 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VairoGL BaderDA SebastianelliWJ SherbondyPSThe TT\u2010TG distance\/trochlear dysplasia index quotient is the most accurate indicator for determining patellofemoral instability risk.Arthroscopy(2021) S0749\u20108063[21]:00770\u201377210.1016\/j.arthro.2021.08.018"},{"key":"e_1_2_9_14_2","doi-asserted-by":"publisher","DOI":"10.1177\/0363546513509058"},{"key":"e_1_2_9_15_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.knee.2020.08.014"},{"key":"e_1_2_9_16_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.knee.2005.06.003"},{"key":"e_1_2_9_17_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.arthro.2021.11.030"},{"key":"e_1_2_9_18_2","doi-asserted-by":"publisher","DOI":"10.1186\/s12891\u2010020\u201003900\u20103"},{"key":"e_1_2_9_19_2","doi-asserted-by":"publisher","DOI":"10.1055\/s\u20100039\u20101688563"},{"key":"e_1_2_9_20_2","doi-asserted-by":"publisher","DOI":"10.1177\/2325967121993179"}],"container-title":["Knee Surgery, Sports Traumatology, 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September 2021","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"21 April 2022","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"17 May 2022","order":3,"name":"first_online","label":"First Online","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The authors declare that they have no conflict of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and\/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the ethics committee of Peking University Third Hospital. (Project Number: 2014099).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Informed consent was obtained from all individual participants included in the study.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed consent"}}]}}