Obturator sign
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The obturator sign is an indicator of irritation to the obturator internus muscle.
In the clinical context, it is performed when acute appendicitis is suspected. In this condition, the appendix becomes inflamed and enlarged. The appendix may come into physical contact with the obturator internus muscle, which will be stretched by this physical examination maneuver. This causes pain and is an evidence in support of an inflamed appendix.
The principles of the obturator sign in the diagnosis of appendicitis are similar to the psoas sign.
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