Sacroiliac joint dysfunction is a source of pain in 10-27% of suspected patients with chronic low back pain, and 42% of women report suffering SI joint pain during pregnancy. It is highly likely that the outpatient therapist will encounter numerous clients with these symptoms. SI joint dysfunction is not well understood, and treatment techniques vary widely. However, aquatic therapy can be an ideal environment for treatment of SI joint pain. This course will review SI joint anatomy, identify why aquatic therapy may be the treatment of choice, and provide the clinician with a sample treatment session.