The posterior portion of the Sacroiliac Joint (SIJ) is innervated by the lateral branches (LBS) of the dorsal ramus of the spinal nerves from S1-S3, with possible contributions from L4 and L5 branches. Many different fluoroscopy techniques for radiofrequency ablation of these (LBs) have been performed for SIJ pain when conservative treatment is not effective. Our current understanding on SIJ posterior innervation shows a Posterior Sacral Network (PSN) formed by these LBs that converges over the lateral sacral crest at the levels between S1-S3. Moreover, chemical neurolysis is a lower-cost option compared to radiofrequency ablation. The purpose of these case reports is to propose a new ultrasound-guided with fluoroscopy verification technique for chemical denervation of the PSN.

中文翻译：

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骶骨背支侧支化学神经松解治疗骶髂关节慢性疼痛：病例报告和技术描述。

骶髂关节 (SIJ) 的后部由来自 S1-S3 的脊神经背支的侧支 (LBS) 支配，可能来自 L4 和 L5 分支。当保守治疗无效时，已经对这些 (LB) 进行射频消融的许多不同的透视技术用于 SIJ 疼痛。我们目前对 SIJ 后神经支配的理解表明，由这些 LB 形成的后骶骨网络 (PSN) 在 S1-S3 之间的水平上汇聚在外侧骶骨嵴上。此外，与射频消融相比，化学神经松解术是一种成本较低的选择。这些病例报告的目的是提出一种新的超声引导和透视验证技术，用于 PSN 的化学去神经支配。