Jefferson Fracture Traumatic Spondylolisthesis

Reverse Your Diabetes Today

Fig.14.14a This CT image shows a fracture of the anterior and posterior arches of the atlas ring. It is quite obvious that this fracture is frequently unstable. The dens axis has completely lost its osseous fixation. b The lateral migration of the joint facets is best documented by this CT image, which was reconstructed in a plane that shows the abnormality to better advantage. The transverse ligament that normally holds the dens in place must also be torn.

Fig.14.14a This CT image shows a fracture of the anterior and posterior arches of the atlas ring. It is quite obvious that this fracture is frequently unstable. The dens axis has completely lost its osseous fixation. b The lateral migration of the joint facets is best documented by this CT image, which was reconstructed in a plane that shows the abnormality to better advantage. The transverse ligament that normally holds the dens in place must also be torn.

Traumatic spondylolisthesis: The second most frequent fracture is the traumatic spondylolisthesis of C2, also called "hangman's fracture" because it is caused by a sudden hyperextension such as occurs during hanging (Fig. 14.16). Depending on the force of the hyperextension, a

Fig. 14.15a This elderly patient—note the degeneration of the intervertebral spaces—has a fracture of the base of the dens (arrow) classified as Anderson II. b An MRI examination of a similar fracture in a different patient illustrates the potential consequence of the resulting osseous instability.

Fracture From Car Wreck

Fig. 14.16 This patient hit the dashboard of his car in a motor vehicle accident. He did not have his seatbelt fastened nor was an airbag installed in his car. The resulting hyperextension has broken his C2 vertebral arch and torn the ligamentary apparatus between C2 and C3. This fracture is evidently unstable.

Fig. 14.16 This patient hit the dashboard of his car in a motor vehicle accident. He did not have his seatbelt fastened nor was an airbag installed in his car. The resulting hyperextension has broken his C2 vertebral arch and torn the ligamentary apparatus between C2 and C3. This fracture is evidently unstable.

the arch of C2 breaks bilaterally (type 1, potentially unstable). If the ligaments and the disk of the articular segment C2/C3 rupture partially (type 2) or completely (type 3), a higher degree of instability results.

f The dens fracture is the most common, the traumatic i spondylolisthesis is the second most common, and the atlas fracture is the third most common fracture of the upper cervical spine.

Traumatic Spondylolisthesis

The T2-weighted, sagittal section documents a signal increase (arrow) along the course of the spinal cord. This signal indicates a contusion of the spinal cord. c This patient has an Anderson III fracture (see inset).

0 0

Post a comment