[7–9] Specifically, several researchers [10–13] hypothesized that the stiffness of specific muscles (rotator cuff) may contribute to posterior shoulder stiffness. These potential mechanisms ...

and the posterior deltoid were measured during the concentric shoulder external rotation task, before and after the exercise. In addition, the muscle activity ratio of the three muscles was calculated ...

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It is often associated with tightness at the anterior side of the shoulder (inflexibility of the pectoralis major/minor muscles) and weakness of the lower trapezius and serratus anterior muscles.

Active MTrPs were most prevalent in the infraspinatus (77%) and the upper trapezius muscles (58%), whereas latent MTrPs were most prevalent in the teres major (49%) and anterior deltoid muscles (38%).

Upper back pain between the shoulder blades may result from poor posture or muscle strain. However, it can also stem from more serious problems with the spine, such as scoliosis or osteoarthritis.

It occurs when a vaccine needle is inserted into the bursa instead of the deltoid muscle. Treatment includes anti-inflammatory medications (oral or injected), and symptoms can last for weeks to months ...

Perioperative posterior cervical muscle plane block significantly decreased numerical pain rating scores 2 hours and 12 hours following procedure, with fewer adverse events, compared with general ...