Intratissue Percutaneous Electrolysis vs Dry Needling in Myofascial Pain Syndrome of Shoulder Pain

This is a parallel-group randomised clinical trial: Primary purpose: To analyse the clinical changes produced by two different physiotherapy treatments (Intratissue Percutaneous Electrolysis and Dry Needling) for myofascial trigger points in the infraspinatus muscle in subjects with non-specific shoulder pain. Hypothesis: A physiotherapy treatment including Intratissue Percutaneous Electrolysis therapy present greater benefits in terms of pain reduction and increased mobility and functionality rather than Dry Needling treatment in subjects with non-specific shoulder pain. The intervention consisted of 3 treatment sessions, different according to the group, once a week. Seven evaluation points were performed, two pre-intervention evaluations one week apart and after the second one the first treatment session was performed. The third and fourth assessments were prior to the second and third treatment sessions, one week apart. The fifth, sixth and seventh assessments were conducted one week, one month and two months after the last treatment session in each group.