###### Abstract  
The purpose of this study was to compare the short-term outcomes of the Multiwave Locked System (MLS) laser therapy versus the combined Transcutaneous nerve stimulation (TENS) and ultrasound therapy in the treatment of the subacromial pain syndrome (SAPS). Forty-seven patients with SAPS were included in the study. Two different rehabilitation protocols were tested: Group 1 (\(n=22\))-MLS laser therapy and physical exercises and Group 2 (\(n=25\))-TENS, ultrasound and physical exercises. The analyzed outcomes were levels of pain, functionality and disability, assessed with visual analog scale (VAS), Constant Shoulder Score (CSS) and the Shoulder Pain and Disability Index (SPADI). The post-treatment evaluations showed significantly better scores in Group 1 patients for VAS score (\(p=0.03\)) and SPADI (\(p=0.04\)). Significant improvement was seen in both groups for all scores. Both treatment regimens showed to be efficient in the treatment of SAPS, improving functionality and reducing pain and disability in the short term. Multiwave Locked System laser therapy in conjunction with physical exercise therapy exercises may have advantages over TENS, ultrasound and physical exercise therapy in the treatment of subacromial pain syndrome. Future studies assessing both short- and long-term outcomes in patients with SAPS treated with different electrotherapy procedures added to the physical therapy are needed. subacromial pain syndrome; multiwave locked system; laser therapy Article  
[PERSON], [PERSON], R.R. ; [PERSON], [PERSON]; [PERSON], [PERSON] The Short-Term Outcomes of Multiwave Locked System (MLS) Laser Therapy versus a Combination of Transcutaneous Nerve Stimulation and Ultrasound Treatment for Subacromial Pain Syndrome  
[PERSON], [PERSON], R.R. ; [PERSON], [PERSON], R. The Short-Term Outcomes of Multiwave Locked System (MLS) Laser Therapy versus a Combination of Transcutaneous Nerve Stimulation and Ultrasound Treatment for Subacromial Pain Syndrome  
[PERSON], [PERSON], R.R. ; [PERSON], [PERSON], R. The Short-Term Outcomes of Multiwave Locked System (MLS) Laser Therapy versus the Combined Transcutaneous nerve stimulation and Ultrasound therapy in the treatment of Subacromial Pain Syndrome  
[PERSON], [PERSON], R.R. ; [PERSON], [PERSON], R. The Short-Term Outcomes of Multiwave Locked System (MLS) Laser Therapy versus a Combination of Transcutaneous Nerve Stimulation and Ultrasound Treatment for Subacromial Pain Syndrome  
thickness and angulation variations of the acromion, coracohumeral distance, acromio clavicular arthrosis, hyperostosis at the greater tuberosity, vascular factors) [3]. Actually, SAPS refers to a wide range of pathologies which include rotator cuff tears, calcite tendinitis, biceps tendinopathy, rotator cuff tendinosis and subacromial bursitis [4]. The incidence of shoulder impingement rises with age, with a peak incidence occurring in the sixth decade of life [5]. It is also common in repetitive overhead sports or in several jobs that require a prolonged overhead position of the arm [3]. From the clinical point of view, it is characterized by chronic pain in the shoulder, with episodes of exacerbation, due to the compression of the structures located in the bony passageway created between the humeral head and acromion, and the ligament connecting it to the coracooid process and coracoid muscles (coracoacromial arch). In fact, the clinical picture varies from a simple supraspinatus tendonitis, in which patients complain of pain when performing an active abduction movement of the shoulder, without limitation of its mobility, to a calcite tendonitis with pain and functional impairment of the upper limb, active movement being impossible. In the frozen shoulder stage, pain disappears completely, but the mobility of the scapulohumeral joint is completely or almost completely abolished (blocked shoulder). The main goals of treatment in SAPS are to reduce pain, improve shoulder motion, shoulder function and quality of life.