Understanding the Obturator Sign and Psoas Sign

The obturator sign is a physical examination maneuver used to assess for irritation of the obturator muscle due to underlying conditions such as appendicitis. It involves flexing the patients right hip and knee, then internally rotating the hip. If the maneuver elicits pain in the right lower quadrant, it may indicate a positive obturator sign.

The psoas sign is another physical examination technique used to detect irritation of the psoas muscle, often seen in cases of appendicitis. To perform the psoas sign, the patient lies on their left side and the examiner extends the right leg at the hip, which stretches the psoas muscle. Pain felt in the right lower quadrant during this maneuver suggests a positive psoas sign.

A positive obturator sign can be indicative of conditions such as appendicitis, pelvic inflammatory disease (PID), or a ruptured ovarian cyst. These conditions can cause irritation or inflammation in the pelvic region, leading to pain upon internal rotation of the hip during the obturator sign test.

The psoas sign is often positive in cases of retrocecal appendicitis, where the appendix is located behind the cecum. In this position, inflammation of the appendix can irritate the psoas muscle, resulting in pain during the psoas sign maneuver. Healthcare providers use this sign as part of the assessment for suspected appendicitis.

Healthcare providers consider a positive obturator or psoas sign as part of a comprehensive clinical assessment for abdominal conditions like appendicitis. These signs, along with other symptoms and diagnostic tests, help providers make informed decisions about the need for further evaluation, such as imaging studies or surgical intervention.