The supraspinatus, infraspinatus, subscapularis (medial, lateral superior, and lateral inferior), teres minor, and deltoid (anterior, medial, and posterior) muscles were evaluated for the existence of active MTrPs. All of these localizations were based on the nomenclature and localization of Travell and Simons.64 Diagnosis was made according to updated Travell and Simons4 diagnostic criteria: the presence of a hypersensitive spot in a palpable taut band, a palpable or visible local twitch response on palpatory stimulus, and reproduction of referred pain elicited by palpation.41,64