High-resolution magnetic resonance-guided posterior femoral cutaneous nerve blocks

Jan Fritz, Cary Bizzell, Sudhir Kathuria, Aaron J. Flammang, Eric H. Williams, Allan J. Belzberg, John A. Carrino, Avneesh Chhabra

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Objective: To assess the feasibility, technical success, and effectiveness of high-resolution magnetic resonance (MR)-guided posterior femoral cutaneous nerve (PFCN) blocks. Materials and methods: A retrospective analysis of 12 posterior femoral cutaneous nerve blocks in 8 patients [6 (75 %) female, 2 (25 %) male; mean age, 47 years; range, 42-84 years] with chronic perineal pain suggesting PFCN neuropathy was performed. Procedures were performed with a clinical wide-bore 1.5-T MR imaging system. High-resolution MR imaging was utilized for visualization and targeting of the PFCN. Commercially available, MR-compatible 20-G needles were used for drug delivery. Variables assessed were technical success (defined as injectant surrounding the targeted PFCN on post-intervention MR images) effectiveness, (defined as post-interventional regional anesthesia of the target area innervation downstream from the posterior femoral cutaneous nerve block), rate of complications, and length of procedure time. Results: MR-guided PFCN injections were technically successful in 12/12 cases (100 %) with uniform perineural distribution of the injectant. All blocks were effective and resulted in post-interventional regional anesthesia of the expected areas (12/12, 100 %). No complications occurred during the procedure or during follow-up. The average total procedure time was 45 min (30-70) min. Conclusions: Our initial results demonstrate that this technique of selective MR-guided PFCN blocks is feasible and suggest high technical success and effectiveness. Larger studies are needed to confirm our initial results.

Original languageEnglish (US)
Pages (from-to)579-586
Number of pages8
JournalSkeletal radiology
Issue number4
StatePublished - Apr 1 2013

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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