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Three column model

denis-three-column-theory.jpg A widely used model for thoracolumbar spine is the Denis three column model.

From a retrospective study of 412 thoracolumbar injury, Francis Denis introduced the concept of middle column or middle osteoligamentous complex between the traditionally recognized posterior ligamentous complex and the anterior longitudinal ligament. This middle column is formed by the posterior wall of the vertebral body, the posterior longitudinal ligament and posterior annulus fibrosus. The third column appears crucial, as the mode of its failure correlates both with the type of spinal fracture and with its neurological deficit. Spine injury is subdivided into minor and major. Minor injuries are represented by fractures of transverse processes, facets, pars interarticularis, and spinous process. Major spinal injuries are classified into four different categories: compression fractures, burst fractures, seat-belt-type injuries, and fracture dislocations. These four well-recognized injuries have been studied carefully in clinical terms as well as on roentgenograms and computerized axial tomograms. They were then subdivided into subtypes demonstrating the very wide spectrums of these four entities 1).

Anterior column

Middle column

Posterior column

Supraspinous ligament and interspinous ligament, facet joints and joint capsule, and ligamentum flavum.

Injury to this column alone does not cause instability.

see Denis classification.

1)
Denis F. The three column spine and its significance in the classification of acute thoracolumbar spinal injuries. Spine (Phila Pa 1976). 1983 Nov-Dec;8(8):817-31. PubMed PMID: 6670016.
three_column_model.txt · Last modified: 2018/08/10 08:23 by administrador