Genicular Artery Embolization for the Treatment of Knee Pain Secondary to Osteoarthritis

Purpose: To evaluate the efficacy and safety of embolization of hyperemic synovial tissue for the treatment of knee pain secondary to osteoarthritis (OA). Materials and Methods: Twenty patients with radiographic knee OA and moderate-to-severe pain refractory to conservative therapy were enrolled in a prospective, 2-site pilot study. Genicular artery embolization (GAE) was performed with 75- or 100-mu m spherical particles. Patients were assessed with magnetic resonance imaging at baseline and at 1 month and with the Visual Analogue Scale (VAS) and the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) at baseline and at 1, 3, and 6 months. Adverse events were recorded at all timepoints. Results: Embolization of at least 1 genicular artery was achieved in 20/20 (100%) patients. Mean VAS improved from 76 mm +/- 14 at baseline to 29 mm +/- 27 at 6-month follow-up (P < .01). Mean WOMAC score improved from 61 +/- 12 at baseline to 29 +/- 27 at 6-month follow-up (P < .01). Self-limiting skin discoloration occurred in 13/20 (65%) patients. Two of 20 (10%) patients developed plantar sensory paresthesia that resolved within 14 days. Conclusions: GAE to treat knee pain secondary to OA can be performed safely and demonstrates potential efficacy. Further randomized comparative studies are needed to determine true treatment effect versus placebo effect.