Saturday, March 1, 2014

The superior shoulder capsule - a potentially important stabilizer

Role of the superior shoulder capsule in passive stability of the glenohumeral joint.

These authors tested 7 cadaveric shoulders to elucidate the function of the superior shoulder capsule. They compared 3 conditions: (1) intact superior capsule, (2) after detaching the superior capsule from the greater tuberosity (tear model), and (3) after complete removal of the superior capsule from the greater tuberosity to the superior glenoid (defect model).

They concluded that the superior shoulder capsule plays an important role in passive stability of the glenohumeral joint. A defect in the superior capsule increased glenohumeral translations in all directions.


At surgery it is of interest to place the suture for a rotator interval plication, but before tying them, to posteriorly translate the humeral head. The interval opens with this posterior translation. When the sutures are tied, the posterior translation is eliminated.

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