Ultrasound-guided Percutaneous Neuromodulation of the Accessory Nerve in Patients With Whiplash Injury

The inclusion criteria were as follows: * Having suffered a traffic accident within a period not exceeding two weeks prior to the assessment. * Diagnosed with Grade I or II Whiplash Associated Disorder (WAD) according to the Quebec Task Force (QTF). * Being at least 18 years of age. * Have a Visual Analogue Scale (VAS) score greater than 20 mm. * Have a cervical disability greater than 10 points according to the NDI. The exclusion criteria were as follows: * Neck pain resulting from previous traffic accidents * Conditions that may interfere with full participation (cardiovascular and neurological diseases and severe mental disorders) * Treatment prior to starting the study * Cervical surgery and congenital spinal disorders * Fractures and dislocations of the neck vertebrae * Alcohol or drug abuse * Allergies to metals * Belonephobia