Question 1602
{"accessible":false,"alternatives":[{"id":7978,"text":"1.5"},{"id":7979,"text":"2"},{"id":7980,"text":"2.5"},{"id":7981,"text":"3"},{"id":7982,"text":"3.5"}],"archived":false,"correctAlternativeId":7982,"explanation":"\u003cp\u003eOnce there is \u003cstrong\u003emore than 3.5 mm\u003c/strong\u003e of total translational motion between flexion and extension, it is considered \u003cstrong\u003egrossly unstable\u003c/strong\u003e. 2 mm is the physiologic range of motion normal people can tolerate, over 2mm is considered hypermobile,\u0026nbsp;\u003c/p\u003e\u003cp\u003eTotal\u0026nbsp;translational motion is the summation of the displacement of the vertebral bodies when tracing the posterior vertebral line on both views i.e. 1.5 mm on flexion and 2.0 mm an extension would be equal to 3.5 mm of translational motion.\u003c/p\u003e","id":1602,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1816","nextQuestionPath":null,"relatedArticles":[{"id":58732,"title":"Cervical spine (flexion and extension views)","link":"/articles/cervical-spine-flexion-and-extension-views?lang=us"}],"alsoUsedIn":[{"id":652,"kind":"Course","title":"Lectures by Matt Skalski - page 652","link":"https://radiopaedia.org/courses/lectures-by-matt-skalski/pages/652"},{"id":652,"kind":"Course","title":"Radiopaedia 2020 - Lectures Only - page 652","link":"https://radiopaedia.org/courses/radiopaedia-2020-exclusive/pages/652"},{"id":652,"kind":"Course","title":"2020 Virtual Conference Private Use - page 652","link":"https://radiopaedia.org/courses/2020-virtual-conference-private-use/pages/652"},{"id":808,"kind":"Course","title":"X-ray Interpretation: Cervical Spine - page 808","link":"https://radiopaedia.org/courses/x-ray-interpretation-cervical-spine/pages/808"},{"id":808,"kind":"Course","title":"Emergency Radiology Course - Melbourne - page 808","link":"https://radiopaedia.org/courses/emergency-radiology-course-melbourne-2022/pages/808"},{"id":808,"kind":"Course","title":"Emergency Radiology Course - Brisbane - page 808","link":"https://radiopaedia.org/courses/emergency-radiology-course-brisbane-2022/pages/808"}],"stem":"\u003cp\u003eWith cervical spine flexion/extension views what amount (in mm)\u0026nbsp;of intersegmental translational motion is considered grossly unstable?\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/1602"}],"attemptsPercentages":[{"alternativeId":"7979","percentage":6},{"alternativeId":"7981","percentage":12},{"alternativeId":"7980","percentage":8},{"alternativeId":"7982","percentage":72},{"alternativeId":"7978","percentage":2}],"promptToLogin":false,"questionManager":false,"articleId":"cervical-spine-alignment"}