Comparing Pain Outcomes of Treatment Strategies for Osteoarthritis Knee Patients

The goal of this clinical trial is to compare two different pain relief techniques (cooled radiofrequency ablation (CRFA) and hyaluronic acid (HA) injection) for patients with knee osteoarthritis (OA) over a period of 6 months. The main questions it aims to answer are: * the extent of reduction of pain score and the proportion of subjects ("responders") whose knee pain is reduced by at least 50% from baseline up to 6 months after treatment in the two treatment groups. * the safety of the two treatment modalities. Participants will undergo a nerve block test to determine if they would experience pain relief from blocking of nerve signals. Responders will be randomised to receive one of the two treatments for their knee pain. Researchers will compare the pain intensity of CRFA and HA injection groups at baseline, 2 weeks, 1 month, 3 months and 6 months post-treatment using validated questionnaires.