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os acetabuli There is a smoothly corticated ossicle apparently embedded in the deep fibers of the anterior capsule adjacent to the anterior acetabular rim, with absence (or non-visualization) of the anterior labrum, and fluid signal coursing through the interval between the anterior superior acetabulum and the ossicle. I presume this is an os acetabulum. It appears to be unstable, given the fluid signal and small focus of BME in the ossicle. There is also a femoral CAM lesion and diminished anteior offset, suggesting predisposition to FAI. There have been many reports of os acetabuli as associated to FAI. I remain confused as to whether it is a predisposing development contributor to, or an acquired ossicle resulting from impingement. The attached abstract (I cannot access this article) seems to differentiate between developmental and acquired ossicles--and the plane of the cleft here is perpendicular to the articular surface. Does that mean its acquired? [ Article ]