Psoas sign
The psoas sign is a medical sign that indicates irritation to the iliopsoas group of hip flexors in the abdomen, and consequently indicates that the inflamed appendix is retrocaecal in orientation (as the iliopsoas muscle is retroperitoneal). It is elicited by performing the psoas test by passively extending the thigh of a patient lying on their side with knees extended, or asking the patient to actively flex their thigh at the hip.[1]
If abdominal pain results, it is a "positive psoas sign". The pain results because the psoas borders the peritoneal cavity, so stretching (by hyperextension at the hip) or contraction (by flexion of the hip) of the muscles causes friction against nearby inflamed tissues. In particular, the right iliopsoas muscle lies under the appendix when the patient is supine, so a positive psoas sign on the right may suggest appendicitis.
See also
References
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es:Signo del psoas pt:Sinal do psoas- ↑ Bickley, Lynn S. Bates' Guide to Physical Exam and History Taking (9th ed.). Lippincott, Williams, and Wilkins. p. 390.
