Korean J Sports Med.  2018 Dec;36(4):173-179. 10.5763/kjsm.2018.36.4.173.

Microinstability of the Shoulder

  • 1Department of Orthopedic Surgery, Korea University Guro Hospital, Seoul, Korea. moonjg@korea.ac.kr


A variety of theories have been reported as causes of shoulder pain in overhead throwing athletes. Recently, an explanation with microinstability of the shoulder and internal impingement has been proposed. The concept of the microinstability is that pathologic laxity of the anterior capsule caused by repeated abduction and external rotation of the shoulder leads to abnormal glenohumeral biomechanics and causes internal impingement of the shoulder. Based on the understanding of the pathology, it is recommended to identify the causes of shoulder pain in the overhead throwing athletes and perform appropriate rehabilitation or surgical treatment.


Shoulder; Microinstability; Internal impingement
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