Psoas sign
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Elicited by the iliopsoas test, the psoas sign is an indicator of irritation to the iliopsoas group of hip flexors in the abdomen.
The test is performed by passively extending the thigh of a patient with knees extended. In other words, the patient is positioned on his/her left side, and the right leg is extended behind the patient. If abdominal pain results, it is a positive psoas sign.
Because the right iliopsoas muscle lies under the appendix when the patient is supine, a "positive psoas sign" may suggest appendicitis.
