Sacro-Iliac Joint Sensory Block and Radiofrequency Ablation: Assessment of Bony Landmarks Relevant for Image-Guided Procedures

Figure 1

Ultrasound-guided sacro-iliac joint (SIJ) radiofrequency ablation (RFA): posterior sacral network (PSN) lateral crest technique. (a) Dissected specimen of the PSN innervating the posterior aspect of the SIJ demonstrating the location of the RFA strip lesion (white line between the first (TST1) and third (TST3) transverse sacral tubercles). The position of the ultrasound probe is indicated by the black rectangle. PSF, posterior sacral foramen; P, posterior superior iliac spine. (b) Transverse ultrasound scan showing sacral bony landmarks at the level of the third transverse sacral tubercle (TST3). Note that the increments of the scale bar on the left margin are 1 cm. AT, articular tubercle.

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