Transcutaneous Pulse Radiofrequency Treatment for Knee Pain

INTERVENTION: Double Blind Randomised Control Trial of Active (5 two‐minute 20ms 2Hz 80V in one treatment session) and Inactive (5 two‐minute 0V in one treatment session) Transcutaneous Pulse Radiofrequency Treatment For Knee Pain in patients awaiting knee replacement surgery. CONDITION: knee osteoarthritis PRIMARY OUTCOME: VAS 0‐100 pain score SECONDARY OUTCOME: 'Timed chair stands, 20m and 400m walks. Ability to perform 4 desired tasks previously limited by pain, Brief Pain Inventory (BPI), Global Treatment Satisfaction score, MOS Short Form‐36, Knee injury Medication usage and perceived need for more treatment. Osteoarthritis Outcome Scale (KOOS) questionnaire Pain Self‐Efficacy questionnaire, Range of movement measured with a goniometer, INCLUSION CRITERIA: Waiting list patients with painful knee(s) rated >=5/10 on a verbal rating scale awaiting knee arthroplasty.