@anatomy.of.motion: Why does an immobile scapula create shoulder pain? . To raise our arms high, the scapula needs to glide across the rib cage in a rotation-like motion. . This movement is primarily driven by the serratus anterior and opposed by the levator scapulae and rhomboid muscles. . The levator is a tonic muscle, meaning that if it's not exercised enough, it becomes overly tight. The rhomboids are generally content with this tightness because it makes their job easier. . Unfortunately, this compromises the movement of the scapula, and without it, our shoulder joint must operate in an exaggerated range of motion, which leads to pain. . . #anatomy#muscle #shoulderpain #scapula #scapularmobility #scapularstability #levatorscapulae #serratusanterior #rhomboidmajor #rhomboids #rhomboidminor #biomechanics