The scapular, or shoulder blade, is a large triangular-shaped bone that lies in the upper back. The bone is surrounded and supported by a complex system of muscles that work together to help you move your arm.
If an injury or condition causes these muscles to become weak or imbalanced, it can alter the position of the scapula at rest or in motion. An alteration in scapular positioning or motion can make it difficult to move your arm, especially when performing overhead activities, and may cause your shoulder to feel weak.
An alteration can also lead to injury if the normal ball-and-socket alignment of your shoulder joint is not maintained.
Treatment for scapular disorders usually involves physical therapy designed to strengthen the muscles in the shoulder and restore the proper position and motion of the scapula.
Scapulothoracic mobilization is one of scapular disorder treatments. Scapulothoracic mobilization is performed when there is dysfunction of the Scapulothoracic articulation (e.g. restriction of upward rotation or lateral glide). Mobilizations that are commonly used include medial/lateral glides, superior/inferior glides, upward and downward rotation, and diagonal patterns.
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(References; orthoinfo.aaos.org, and physio-pedia.com)