A Novel Technique for Sacroiliac Joint Radiofrequency Ablation: Combining Ultrasound and X-Ray Annotation for Enhanced Precision and Patient Comfort

The sacroiliac Joint (SIJ) is the largest axial joint in the body, with extensive sensory innervation.SIJ is a diarthrodial joint.The primary role of the SIJ is to provide stability and offset the load of the trunk to the lower limbs.An extensive architecture of ligamentous structures provides the stability of the joint.The key differences between other di-arthrodial joints and sacroiliac Joints are the presence of fibrocartilage and hyaline cartilage, discontinuity of the posterior capsule and many ridges and depressions that minimize movement and increase stability.The sacroiliac joint is innervated anteriorly by the anterior rami of L4, L5 and superior gluteal nerve.The posterior innervation is by the posterior sacral network (PSN), which originates from S1 to S3 lateral sacral nerves derived from their respective posterior rami (with occasional contribution from S4 and L5).