Tubercle of Assaki

Last revised by Dr Yuranga Weerakkody on 30 Oct 2021

Tubercle of Assaki (also known as tubercle of Asskay 3) is a small bony protuberance of the central part of glenoid fossa with accompanying thinning of articular cartilage in this location 1.

It is presumably caused by constant pressure of the humeral head exerted on the inferior glenoid fossa 3. It is believed to be closely related to the glenoid bare spot, which is found in the same location. Some authors treat both these entities as practically identical 2.3.

It is a small (about 6 mm of average diameter 2) thickening of subchondral bone of the glenoid fossa, which is overlaid by the area of thinned cartilage known as glenoid bare spot 2.

Like the glenoid bare spot, it is best appreciated using fluid-sensitive sequences like T2 FSE in coronal and axial planes and it should not be mistaken for a cartilage defect 1.

The tubercle was first described by a French anatomist, Asskay 3.

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Cases and figures

  • Case 1
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