![]() The role of MRI for direct inspection of the alar ligaments and tectorial membrane is questionable. Anderson classification is more widely accepted. ![]() This group suggested that more than 8 degrees of rotation or 1 mm of translation of the occiput relative to C1, direct evidence of alar ligament avulsion, or MRI evidence of atlanto-axial disruption is consistent with instability. proposed a classification scheme consisting of type 1 (nondisplaced), type 2a (displaced stable), and type 2b (displaced unstable) fractures. These fractures are classified into three types by the Anderson and Montesano scheme: Type I – comminuted and nondisplaced secondary to axial loading Type II – extend into the condyle from a linear fracture in the remainder of the skull base (generally involve the base of the occipital condyle without complete separation of the condyle from the skull) Type III – avulsion fractures of the occipital condyle. ![]() Occipital condyle fractures need to be evaluated with multiplanar CT, as they may at times be clearly seen in a single plane only. ![]() 19 Isolated Fracture of the Anterior or Posterior Arch of AtlasĢ5 Vertebral Body Microfractures / Bone Marrow EdemaĢ6 Jefferson Burst Fractures of the AtlasĢ7 Burst Fractures (Other Than Jefferson Fracture)ĭaniela Distefano and Alessandro Cianfoni ![]()
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