Occipital condyle fracture. The fragment
was avulsed by the (intact) alar ligament. On the plain radiograms
this fracture was barely visible and was only detected at
second–look evaluation. The avulsed fragment is displaced
posteriorly and medially, embedding medium fills the wide fracture
gap. Note the tom posterior joint capsule and muscle ruptures under
the posterior arch of the atlas. The vertebral artery and the
underlying C1 nerve are surrounded by wide venous sinuses. In the
atlanto–axial joint the posterior meniscoid and the joint capsule
are tom, pulling the C2 nerve into the joint space.
©2000 Wolfgang Rauschning, M.D., Ph.D.
Professor of Clinical Anatomy
Department of Orthopaedic Surgery
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