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.
It could also be done by flexing the hip to 90 degrees -- with flexed knee -- asking the patient to actively flex their thigh against resistance.
Spinal infection caused by Mycobacterium avium complex in a patient with no acquired immune deficiency syndrome: a case report
Dec 01, 2008; ABSTRACT Spinal infection caused by Mycobacterium avium complex (MAC) is rarely seen in people who do not have acquired immune...