{"id":20571,"date":"2025-06-14T14:29:01","date_gmt":"2025-06-14T14:29:01","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=20571"},"modified":"2025-06-14T14:29:03","modified_gmt":"2025-06-14T14:29:03","slug":"going-from-90-degrees-glenohumeral-abduction-to-180-degrees-abduction-what-is-the-amount-in-degrees-of-scapular-rom-contributing-to-the-overall-shoulder-rom","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/going-from-90-degrees-glenohumeral-abduction-to-180-degrees-abduction-what-is-the-amount-in-degrees-of-scapular-rom-contributing-to-the-overall-shoulder-rom\/","title":{"rendered":"Going from 90 degrees glenohumeral abduction to 180 degrees abduction, what is the amount (in degrees) of scapular ROM contributing to the overall shoulder ROM"},"content":{"rendered":"\n<p>Going from 90 degrees glenohumeral abduction to 180 degrees abduction, what is the amount (in degrees) of scapular ROM contributing to the overall shoulder ROM? Group of answer choices 30 degrees 45 degrees 90 degrees 15 degrees<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\"><strong>The correct answer and explanation is:<\/strong><\/mark><\/p>\n\n\n\n<p><strong>Correct Answer: 60 degrees<\/strong> (not among the choices, so we must reconcile with the closest plausible logic\u2014<strong>45 degrees<\/strong> is the best fit among the provided options, though not exact).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The motion of shoulder abduction from 0\u00b0 to 180\u00b0 involves both <strong>glenohumeral (GH) joint movement<\/strong> and <strong>scapulothoracic (ST) motion<\/strong>, a relationship known as the <strong>scapulohumeral rhythm<\/strong>. This coordination ensures full range of shoulder motion.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Scapulohumeral Rhythm:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The classic scapulohumeral rhythm ratio is <strong>2:1<\/strong>, meaning:\n<ul class=\"wp-block-list\">\n<li>For every <strong>3 degrees<\/strong> of shoulder abduction,<\/li>\n\n\n\n<li><strong>2 degrees<\/strong> come from the GH joint,<\/li>\n\n\n\n<li><strong>1 degree<\/strong> comes from scapular upward rotation.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Applying This to the Range of Motion:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>From <strong>90\u00b0 to 180\u00b0<\/strong> of shoulder abduction = <strong>90\u00b0 total shoulder ROM<\/strong>.<\/li>\n\n\n\n<li>Using the 2:1 ratio:\n<ul class=\"wp-block-list\">\n<li><strong>60\u00b0<\/strong> from the glenohumeral joint.<\/li>\n\n\n\n<li><strong>30\u00b0<\/strong> from the scapular motion (scapulothoracic joint).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>So the <strong>correct scapular contribution<\/strong> to shoulder motion from <strong>90\u00b0 to 180\u00b0<\/strong> is <strong>30 degrees<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Final Clarification:<\/h3>\n\n\n\n<p><strong>Answer:<\/strong> \u2705 <strong>30 degrees<\/strong><\/p>\n\n\n\n<p>Though \u201c30 degrees\u201d is the correct anatomical value, if &#8220;45 degrees&#8221; is required by your source or curriculum due to variation or broader interpretation of shoulder complex motion, it might be accepted in that context. However, the textbook-based anatomical answer is <strong>30 degrees of scapular motion<\/strong> in the 90\u00b0\u2013180\u00b0 abduction range.<\/p>\n\n\n\n<p>Always check with the clinical framework or textbook your course uses (e.g., <em>Kinesiology by Neumann<\/em> or <em>Anatomy of Movement<\/em>), as minor variations may exist.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Going from 90 degrees glenohumeral abduction to 180 degrees abduction, what is the amount (in degrees) of scapular ROM contributing to the overall shoulder ROM? Group of answer choices 30 degrees 45 degrees 90 degrees 15 degrees The correct answer and explanation is: Correct Answer: 60 degrees (not among the choices, so we must reconcile [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-20571","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/20571","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=20571"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/20571\/revisions"}],"predecessor-version":[{"id":20572,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/20571\/revisions\/20572"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=20571"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=20571"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=20571"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}