Psoas sign

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Psoas Sign

Psoas sign (/ˈsoʊ.æs/ SOH-as), also known as Obraztsova's sign, is a medical sign that indicates irritation to the psoas muscle. This irritation can be caused by an appendicitis or other abdominal conditions. The sign is named after the psoas muscle, which is a long muscle located on the side of the lumbar region of the vertebral column and brim of the pelvis.

Pronunciation

The term "psoas" is pronounced as /ˈsoʊ.æs/ SOH-as.

Etymology

The term "psoas" comes from the Greek word "psoa", meaning "loin". The term "sign" in this context is used to denote a medical indication of a certain health condition.

Procedure

The psoas sign is elicited by having the patient lie on their left side while the right knee is extended, which stretches the right psoas muscle. If this maneuver results in abdominal pain, it is considered a positive psoas sign, indicating irritation of the psoas muscle by an inflamed appendix or other abdominal condition.

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