Ross Hauser, MD, Danielle R. Steilen-Matias, MMS, PA-C Iliolumbar ligament injury; Iliolumbar syndrome; Iliac crest pain syndrome You are an athlete or someone who does physically demanding work and you have low back, groin, and hip pain. You had significant enough pain that you needed the help of a health care specialist. During your consultation, you may have described the pain to your health provider as severe and acute at times and radiating out from the center of your low back to the top of your hip or pelvis, (the iliac crest) and into your groin region. As low back, …