Also known as Gaenslen’s maneuver. This is a physical exam test in which the doctor is looking for SI joint pain. To perform the test, the patient lies on his/her back with one leg hanging off the table.  The other leg is bent at the hip and knee, and the patient is asked to hold the knee to his chest.  The doctor than pushes the other knee further down off the table, in effect hyper-extending the hip.  If this produces pain, it can suggest SI or hip joint pain, pubic symphysis pain, or femoral nerve irritation.