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Figures and Tables
Fig. 1
Schematic drawing of a transverse section of the spinal cord at the thoracic level, showing the anatomic organization of the corticospinal tract and posterior column (L: lumbar, S: sacral, T: thoracic).
Fig. 2
Types of spinal cord injury (shaded zones) that produce the four main incomplete injury patterns seen clinically.
(A) Central cord syndrome.
(B) Anterior cord syndrome.
(C) Brown-Sequard syndrome.
(D) Posterior cord syndrome.
Fig. 3
Denis three-column model of spinal stability which involves anterior (anterior 1/2 of vertebra/disc and anterior longitudinal ligament), middle (posterior 1/2 of vertebra/disc and posterior longitudinal ligament), and posterior (posterior elements including the pedicles and facet joints and the remaining ligaments) columns. According to this paradigm, any injury extending into the middle column is largely considered to be unstable.
Fig. 4
Denis classification of thoracolumbar compression injuries. These fractures may involve both endplates (A, type A), the superior endplate only (B, type B), the inferior endplate only (C, type C), or a buckling of the anterior cortex with both endplates intact (D, type D).
Fig. 5
Denis classification of thoracolumbar burst fractures.
(A~C) Types A, B, and C represent fractures of both endplates, the superior endplate, and the inferior endplate, respectively.
(D) Type D is a combination of a type A burst fracture with rotation, which is best appreciated on an anteroposterior radiograph. The superior or inferior endplate, or both, may be involved with this fracture.
(E) Type E is eccentrically loaded type A fracture.
Fig. 6
Denis classification of flexion-distraction injuries. These may occur at one level through the bone (A), at one level through the ligaments and disc (B), at two levels, with the middle column injured through the bone (C), or at two levels with the middle column injured through the ligament and disc (D).
Fig. 7
Denis classification of fracture-dislocations. These may occur at one level through the bone (A), at one level through the ligaments and disc (B), or at two levels, with the middle column injuried through the bone or at two levels with the middle column injuried through the ligament and disc (C).
Fig. 8
The load sharing classification system for thoracolumbar fractures identifies injuries that may be appropriately treated with short-segment posterior instrumentation constructs by assigning points based on the extent of vertebral body comminution, apposition of the body fragments, and the degree of focal kyphosis.
Fig. 9
A 36-year old man got injured by a fall from height, who was diagnosed with complete paraplegia due to the cord injury with unstable bursting fracture at T12 and L1 (A, B).
The preoperative MRI (C), and CT (D) showed the cord compressed by the retropulsed bony fragments. He underwent indirect reduction by ligamentotaxis using segmental pedicle screw instrumentation from T11 to L2 with distraction (E, F).
Postoperative CT (G) and MRI (H) shows the cord decompressed after the operation, but the patient has not recovered from the complete paraplegia.
Fig. 10
A 53-year old lady was operated on her back to fix the T12 bursting fracture at other hospital. When she visited our spine center 15 months later from the initial operation, she complained of severe back pain and numbness on her both lower extremities with thoracolumbar kyphosis. She couldn't lie flat on her back due to aggravating back pain and leg numbness. Preoperative x-ray showed thoracolumbar kyphosis and pull out of both L1 pedicle screws (A~C).
In the CT and MRI findings, the spinal cord compressed slightly by the sharp margin of T12 body (D, E).
The spinal cord decompressed by modified PSO and the spinal column realigned normally (F~H).
At 5 months postoperatively, the operation site was fused solidly without loss of correction (I, J).
And the leg symptoms were resolved completely.
Fig. 11
A 68-year old man sustained a bony chance fracture at T12 by a fall (A, B).
Preoperative CT showed clear fracture line at the T12 body and lamina (C).
The fracture was reduced by cantilever method using USS universal spine system (D, E).
Fig. 12
A flexion-distraction type injury at T12 and L1 and compression fracture of L4 which involving both end plates by a fall from height. The 28-year old man got 60% flame burn on his both lower extremities and the trunk. The spinal operation was delayed for 4 and half months to care the burn wound. The preoperative x-ray shows kyphosis at the thoracolumbar junction with wedging of L1 body (A, B).
Preoperative parasagittal CT shows bilateral facet dislocation of T12 and L1 (C, E).
The patient complained paraparesis at both lower extremities and the CT shows the dislodged posterosuperior coner of L1 body was compressing the spinal cord (D).
The spinal cord decompressed by modified pedicle subtraction osteotomy at L1, and the spinal alignment normalized very nicely. The patient's neurologic symptoms were subsided after the operation (F~H).
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