Comparison between Ultrasound-guided Pulsed Radiofrequency Ablation of the Medial Calcaneal Nerve and Extracorporeal Shockwave Therapy in Managing Recalcitrant Plantar Fasciitis: A Randomised Controlled Trial

Abstract

Introduction: Plantar Fasciitis (PF) is one of the most common causes of heel pain, with a prevalence ranging from 3.6-7% in the general population. Approximately 90% of patients with PF respond well to conservative therapy, including rest, stretching, analgesics, physical therapy, shoe modifications, or steroid injections. However, around 10% of patients have recalcitrant cases that require invasive or surgical interventions. Pulsed Radiofrequency Ablation (PRFA) is a non neurodestructive method that provides non surgical pain relief in such cases. Aim: To compare the effectiveness of ultrasound-guided PRFA of the Medial Calcaneal Nerve (MCN) and Extracorporeal Shockwave Therapy (ESWT) in managing recalcitrant PF. Materials and Methods: This randomised controlled trial was conducted at the Department of Physical Medicine and Rehabilitation, Regional Institute of Medical Sciences, Imphal, Manipur, India over a two-year period from September 2018 to August 2020. A total of 78 patients with PF were included in the study, divided equally into two groups: a study group and a control group, each consisting of 39 participants. The study group received PRFA of the MCN, while the control group received ESWT of the plantar fascia. The Visual Analog Scale (VAS), Plantar Fascia Thickness (PFT), and American Orthopaedic Foot and Ankle Society (AOFAS) hindfoot score were measured at 1, 4, 12, and 24 weeks as outcome variables. Data analysis was performed using Statistical Package for the Social Sciences (SPSS) version 21.0, and statistical tests like Chi-square test, t-test, and repeated measures Analysis of Variance (ANOVA) were used. A p-value of <0.05 was considered significant. Results: Of the 78 patients included in the study, 42 (53.8%) were females and 36 (46.2%) were males, with a mean age of 41.08±10.09 years. The VAS score in the study group improved from 5.51±0.82 at baseline to 1.92±0.80 at 24 weeks, while in the control group, the VAS score improved from 5.36±0.97 at baseline to 2.33±0.66 at 24 weeks. PFT in the study group improved from 4.45±0.374 at baseline to 2.26±0.231 at 24 weeks, while in the control group, PFT improved from 4.42±0.366 at baseline to 2.49±0.357 at 24 weeks. The AOFAS score also improved from 50.49±13.13 at baseline to 74.03±11.53 in the study group, and in the control group, the AOFAS score improved from 49.74±12.26 at baseline to 71.36±10.72 at 24 weeks (p-value <0.05). Conclusion: Significant improvements were observed in all outcome measures in both the study and control groups, with a p-value <0.05. However, the improvements were more pronounced in the study group, with minimal to no sideeffects. Hence, ultrasound-guided PRFA of the MCN can be considered an effective minimally invasive treatment modality for recalcitrant PF.