Dry Needling vs Dry Needling With ES in Patients With Neck/Shoulder Pain

First, we aim to determine if there is a difference in the rate of improvement, as measured by the Neck Disability Index (NDI) and Numerical Pain Rating Scale (NPRS), across a 6 week treatment period between those treated with DN only and those treated with DN and intramuscular electrical stimulation (IES) in subjects with upper trapezius active trigger points (aTrPs). Secondly, we want to determine if improvements in clinical outcomes (NDI and NPRS) of patients with upper trapezius active trigger points (aTrPs) treated with dry needling (DN) alone or dry needling with intramuscular electrical stimulation (DN/IES) are maintained 6 weeks post treatment without further intervention. Research Questions: 1. Is there a difference in the rate of improvement in NDI and NPRS across a 6 week treatment period in subjects with upper trapezius active trigger points (aTrPs) between those treated with DN only and those treated with DN and intramuscular electrical stimulation (IES)? 2. Are improvements in clinical outcomes (NDI and NPRS) of patients with upper trapezius active trigger points (aTrPs) treated with dry needling (DN) maintained 6 weeks post treatment without further intervention? Tertiary exploration: If improvement is maintained, is there a difference in outcome maintenance between groups? Did improvement increase between 6 and 12 weeks?