Question 1112

{"accessible":false,"alternatives":[{"id":5556,"text":"it gives a PPV of above 90% for medial meniscal tear but less than 60% for lateral meniscal tear "},{"id":5557,"text":"it applies to horizontal and vertical longitudinal tears but not to radial tears"},{"id":5558,"text":"it was validated on 1.5 T MRI but is also thought to apply to 3.0 T MRI"},{"id":5559,"text":"the signal abnormality must be seen on two contiguous slices in the same plane"},{"id":5560,"text":"the signal abnormality must extend to the meniscal periphery"}],"archived":false,"correctAlternativeId":5558,"explanation":"\u003cp\u003eThe \u003ca title=\"Two-slice-touch rule (knee MRI)\" class=\"internal\" href=\"/articles/two-slice-touch-rule-knee-mri\"\u003etwo-slice-touch rule\u003c/a\u003e is satisfied if intra-meniscal high signal extends to the meniscal superior articular surface, inner free edge or inferior articular surface on at least two MRI slices. These two slices may be contiguous in the same plane, but can also be in different planes at the same anatomical location (eg. single sagittal slice\u0026nbsp;and single coronal slice). Signal contacting the meniscal periphery does not form any part of the rule.\u0026nbsp;\u003c/p\u003e\u003cp\u003eIt applies equally to radial tears just as it does to horizontal tears and vertical longitudinal tears. Radial root tears can often be\u0026nbsp;reliably diagnosed on a single slice, and therefore the rule is not always applied to this small subset of\u0026nbsp;radial tears.\u003c/p\u003e\u003cp\u003eIt was initially validated for 1.5 T MRI but is also thought to apply to 3.0 T MRI. It has a high PPV for both medial and lateral meniscal tears. The reported PPV values vary between studies however the medial meniscus tear PPV is consistently above 90% and the lateral meniscus tear PPV is often just as high, and is certainly nowhere near as\u0026nbsp;low\u0026nbsp;as\u0026nbsp;60%.\u0026nbsp;\u003c/p\u003e","id":1112,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1112","nextQuestionPath":null,"relatedArticles":[{"id":32943,"title":"Meniscal tear","link":"/articles/meniscal-tear?lang=us"},{"id":41728,"title":"Radial meniscal tear","link":"/articles/radial-meniscal-tear?lang=us"},{"id":39357,"title":"Vertical meniscal tear","link":"/articles/vertical-meniscal-tear?lang=us"},{"id":40036,"title":"Meniscal root tear","link":"/articles/meniscal-root-tear?lang=us"},{"id":44003,"title":"Horizontal meniscal tear","link":"/articles/horizontal-meniscal-tear?lang=us"}],"alsoUsedIn":[{"id":233,"kind":"RestrictedPage","title":"Page 233 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/233"},{"id":236,"kind":"Course","title":"Radiology Review Course - Melbourne - page 236","link":"https://radiopaedia.org/courses/radiology-review-course-melbourne-2019/pages/236"},{"id":236,"kind":"Course","title":"Radiology Review Course - Melbourne - page 236","link":"https://radiopaedia.org/courses/radiology-review-course-melbourne-2018/pages/236"},{"id":236,"kind":"Course","title":"Radiology Review Course - Melbourne - page 236","link":"https://radiopaedia.org/courses/radiology-review-course-melbourne-2020/pages/236"},{"id":236,"kind":"Course","title":"Radiology Review Course - page 236","link":"https://radiopaedia.org/courses/radiology-review-course-online/pages/236"},{"id":637,"kind":"Course","title":"Radiopaedia 2020 - Lectures Only - page 637","link":"https://radiopaedia.org/courses/radiopaedia-2020-exclusive/pages/637"},{"id":637,"kind":"Course","title":"Musculoskeletal Lectures - page 637","link":"https://radiopaedia.org/courses/musculoskeletal-lectures/pages/637"},{"id":637,"kind":"Course","title":"2020 Virtual Conference Private Use - page 637","link":"https://radiopaedia.org/courses/2020-virtual-conference-private-use/pages/637"},{"id":925,"kind":"RestrictedPage","title":"Page 925 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/925"},{"id":926,"kind":"RestrictedPage","title":"Page 926 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/926"}],"stem":"\u003cp\u003eWhich is true regarding the \"two-slice-touch\" rule for meniscal tear diagnosis on MRI?\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/1112"}],"attemptsPercentages":[{"alternativeId":"5557","percentage":14},{"alternativeId":"5558","percentage":22},{"alternativeId":"5556","percentage":11},{"alternativeId":"5560","percentage":20},{"alternativeId":"5559","percentage":34}],"promptToLogin":false,"questionManager":false,"articleId":"two-slice-touch-rule-knee-mri"}