Purpose: Subacromial impingement syndrome is the most common shoulder condition. Myofascial trigger points in teres major muscle can be associated with this syndrome. The investigators objective is to find out if adding manual therapy specifically for teres major trigger points can produce better results in these patients.

Method: A randomized controlled pilot study was carried out. Fifty people were randomly assigned to one of two groups: intervention group or control group. Both groups received a protocolized physical therapy treatment while the intervention group additionally received manual therapy for teres major trigger points.

Inclusion Criteria:

• Age 18 years and over
• Clinical diagnosis of Subacromial Impingement Syndrome.
• Detectable trigger points in teres major muscle.
• Sign informed consent form.

Exclusion Criteria:

• Presence of wounds or cutaneous alterations in the shoulder region
• Previous surgery in the shoulder
• Presence of acute inflammatory process in the shoulder (< 7 days),
• Being involved in litigation or compensation processes
• Not having a domain of the language that could make the informed consent not understandable.