Many years ago we pointed out that one of the means by which the humeral head stays centered in the glenoid is the suction cup effect as shown here by our late partner Doug Harryman.
In performing a ream and run procedure, one of the important steps is to assure that an extralabral capsular release is performed as shown here.
When a substantial labrum can be preserved, the suction cup effect can be observed when the humeral head is translated posteriorly. Turn your volume up, so you can hear the 'kiss'.
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