Question 2392
{"accessible":false,"alternatives":[{"id":11785,"text":"extension"},{"id":11786,"text":"15° flexion"},{"id":11787,"text":"30° flexion"},{"id":11788,"text":"60° flexion"}],"archived":false,"correctAlternativeId":11785,"explanation":"\u003cp\u003eThe \u003ca href=\"/articles/patellar-translation-tt-tg-distance\"\u003eTT-TG distance\u003c/a\u003e can be influenced by the degree of knee flexion (reduces with flexion) – it should be measured with full knee extension.\u003c/p\u003e\u003cp\u003eThe tibia rotates externally in terminal knee extension (evaluation with the knee in slight flexion would render incorrect, inferior values). Furthermore, it is important to remember that as the knee joint ranges from extension to flexion, the articular surface area of the patella that is in contact with the femur will change. In full extension, the patella has little to no contact with the trochlear groove and, therefore, is at higher risk for instability.\u003c/p\u003e","id":2392,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2392","nextQuestionPath":"/articles/tibial-tuberosity-to-trochlear-groove-distance-tt-tg-distance/questions/2390","relatedArticles":[],"alsoUsedIn":[{"id":1347,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1347","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1347"},{"id":1200,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1200","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1200"},{"id":248,"kind":"LiveSchedule","title":"248","link":"https://radiopaedia.org/admin/live_schedules/248"},{"id":159,"kind":"LiveSchedule","title":"159","link":"https://radiopaedia.org/admin/live_schedules/159"},{"id":1275,"kind":"Course","title":"2022 Virtual Conference Private Use - page 1275","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/1275"},{"id":1275,"kind":"Course","title":"Musculoskeletal Lectures - page 1275","link":"https://radiopaedia.org/courses/musculoskeletal-lectures/pages/1275"}],"stem":"\u003cp\u003eThe patellar translation, also known as tibial tuberosity\u0026nbsp;- trochlear groove (TT-TG) distance, should be measured when the knee is in...\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/2392"}],"attemptsPercentages":[{"alternativeId":"11785","percentage":74},{"alternativeId":"11787","percentage":14},{"alternativeId":"11788","percentage":3},{"alternativeId":"11786","percentage":9}],"promptToLogin":false,"questionManager":false,"articleId":"tibial-tuberosity-to-trochlear-groove-distance-tt-tg-distance"}