Lower back pain is one of the most common presenting symptoms seen in orthopaedic practice. The sacroiliac (SI) joint is an often overlooked source of lower back pain, although 10% to 26% of patients presenting with chronic back and buttock pain are subsequently found to have disorders of the SI joint. The gold standard for diagnosing SI joint dysfunction is an image‐guided injection. SI joint injections provide an important diagnostic tool as well as an effective therapeutic pain‐relief option. This article presents a safe and reproducible technique for SI joint injections.