We reported unusual two impingement syndrome with middle glenohumeral ligament(MGHL). (Case1) A 37 years old man was pointed out impingement syndrome by other hospital. He became conscious of instability and instability of second internal rotation. O'Brien's test, Whipple test, CAT(Combine Abduction Test), and HFT(Horizontal Flexion Test) is positive. (Case 2) A 19 years old man had left shoulder pain before 1 year. He is weight lifter, and became conscious of pain on snatch. He did not feel to be put out of joint but to be unstable. On MRI there is not Bankart lesion, and labrum injury is not unclear. In both two case, conservative treatment with rehabilitation is continued for 4 month, but symptom is not disappeared. Therefore we operated with arthroscopy. In both two case, there is not Bankart lesion, but capsular tear is recognized with impinge of MGHL into joint. We operated capsular repair and debridement. Immediately, symptom of impingement is lost and they come back sport completely for about 1 year. MGHL started on glenoid tuberculum and superior anterior labrum and touch the lesser tubercle. It is reported that MGHL is 63% on shoulder joint and thin and string MGHL is occurred anterior instability. In our study, we found hypertrophy on MGHL. We consider that MGHL is taken into joint and occurred impingement and capsular tear. On result they felt instability. It was supposed that we have one of variation for glenohumeral ligament complex.