The scapulothoracic joint (STJ) is a non-synovial articulation between the scapula and chest wall and is supported by surrounding soft tissue, muscles, and bursae. It functions with acromioclavicular joint and associated ligaments to provide stability and enable various shoulder motions, including lifting and overhead activities, in coordination with the glenohumeral joint. The STJ’s role in the “scapulohumeral rhythm” is crucial for proper shoulder function. Alterations in scapular position or movement, known as scapular dyskinesis, can arise from a variety of etiologies including structural bony or soft tissue lesions, overuse sports injuries, occupation-related injuries and trauma. This chapter covers the anatomy, imaging techniques, US scanning technique and pathologies of the STJ.