Group H, involved a high voltage PRF technique, where the voltage started at 65 V and could be adjusted up to 80 V based on patient tolerance. Both protocols involved two cycles of PRF application, with each cycle lasting 240 seconds and comprising alternating periods of current application and deactivation. The pulse rate frequency was set at 2 Hertz (Hz), resulting in two active phases/second (20 milliseconds (ms) of current application followed by 480 ms without stimulation).

utilized a standard voltage PRF technique, administering PRF at a fixed voltage of 45 volts (V).

nvolved a high voltage PRF technique, where the voltage started at 65 V and could be adjusted up to 80 V based on patient tolerance. Both protocols involved two cycles of PRF application, with each cycle lasting 240 seconds and comprising alternating periods of current application and deactivation. The pulse rate frequency was set at 2 Hertz (Hz), resulting in two active phases/second (20 milliseconds (ms) of current application followed by 480 ms without stimulation)

Number of patients with successful pain relief at 6 months post-intervention which is defined as more than or equal 50% reduction in VAS from pre-interventional level

Vas score ranges from 0 to ten . 0= NO pain.... 1-3= mild pain .... 4-6 = moderate pain ... 6-10= severe untearable pain

1- the impact of treatment on the Neck Disability Index which was evaluated before treatment and at 6 months following treatment