The goal of this clinical trial is to compare the efficiency and efficacy of genicular nerves blockade by chemical phenol neurolysis versus radiofrequency ablation in managing pain in patients suffering from grade IV KOA in term of NRS pain score.
The participants will be evaluated by numeric rating scale and oxford knee score for assessment of pain relief up to 16 weeks.
Grade 4 knee osteoarthritis according to Kellgren-Lawrence radiological classification.
Failure to manage pain with conservative methods.
Prior knee replacement
Patients with cardiac pacemakers or implantable cardiac defibrillators.
Septic knee or systemic sepsis.
Allergy to any of the drugs used in the study.