Obturator Sign

The obturator sign, also known as the Cope sign, is an indicator of irritation to the obturator internus muscle.

The technique for detecting the obturator sign, called the obturator test, is carried out on each leg in succession. The patient lies on his back with the hip and knee both flexed at ninety degrees. The examiner holds the patient's ankle with one hand and knee with the other hand. The examiner rotates the hip by moving the patient's ankle away from the patient's body while allowing the knee to move only inward. This is flexion and internal rotation of the hip.

In the clinical context, it is performed when acute appendicitis is suspected. In this condition, the appendix becomes inflamed and enlarged. The appendix may come into physical contact with the obturator internus muscle, which will be stretched when this maneuver is performed on the right leg. This causes pain and is an evidence in support of an inflamed appendix.

The principles of the obturator sign in the diagnosis of appendicitis are similar to that of the psoas sign.

Evidence shows that the Obturator Test does not adequately diagnose appendicitis.