The purpose of this clinical trial is to compare the effects of deep versus superficial dry needling (DN) on the ultrasound and electromyographic (EMG) characteristics of myofascial trigger points (MTrPs) in the upper trapezius muscle of patients with neck pain.
Researchers aim to determine which dry needling technique produces greater improvements in muscle properties (ultrasound and EMG findings), pain intensity, and functional disability.
Intervention:
Participants will be randomly assigned to receive either deep DN or superficial DN. Each participant will undergo four treatment sessions over a two-week period.
Assessments:
Outcomes will be measured at three time points:
* Baseline (before treatment)
* Post-treatment (end of week 2)
* Follow-up (4 weeks after treatment)