Os acetabuli
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Os acetabuli (plural: ossa acetabuli) is an unfused secondary ossification centre of the acetabulum.
Gross anatomy
Ossa acetabuli are located at the anterosuperior margin. They are rounded in shape with a concave lateral border and convex medial border. They may be bilateral and partially fused to the acetabulum.
Ossa acetabuli are normally seen in children but typically fuse in mid-to-late teens, being uncommonly seen in adults.
Related pathology
Ossicles in the acetabular region may also be found in:
- femoroacetabular impingement
- hip dysplasia
- osteochondrosis dissecans
- post-traumatic or degenerative bone fragments
Some consider those present in dysplastic hips to represent fatigue fractures of the acetabular rim due to overload 4.
Differential diagnosis
In some situations consider:
-<p><strong>Os acetabuli</strong> (plural: ossa acetabuli) is an unfused <a href="/articles/ossification-centres">secondary ossification centre</a> of the <a title="acetabulum" href="/articles/acetabulum">acetabulum</a>.</p><h4>Gross anatomy</h4><p>Ossa acetabuli are located at the anterosuperior margin. They are rounded in shape with a concave lateral border and convex medial border. They may be bilateral and partially fused to the <a href="/articles/acetabulum">acetabulum</a>.</p><p>Ossa acetabuli are normally seen in children but typically fuse in mid-to-late teens, being uncommonly seen in adults.</p><h4>Related pathology</h4><p>Ossicles in the acetabular region may also be found in: </p><ul>- +<p><strong>Os acetabuli</strong> (plural: ossa acetabuli) is an unfused <a href="/articles/ossification-centres">secondary ossification centre</a> of the <a href="/articles/acetabulum">acetabulum</a>.</p><h4>Gross anatomy</h4><p>Ossa acetabuli are located at the anterosuperior margin. They are rounded in shape with a concave lateral border and convex medial border. They may be bilateral and partially fused to the <a href="/articles/acetabulum">acetabulum</a>.</p><p>Ossa acetabuli are normally seen in children but typically fuse in mid-to-late teens, being uncommonly seen in adults.</p><h4>Related pathology</h4><p>Ossicles in the acetabular region may also be found in: </p><ul>
Images Changes:
Image 5 Annotated image (Zoomed AP view) ( update )
Caption
was changed:
Case 65: with femoroacetabular impingement - cam-type
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