This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ohopaedics Q Bank, Subject name: Orthopaedics
According to Denis classification, the middle column includes all of the following, except: 
Select and explain. 
A. Posterior longitudinal ligament, B. Posterior elements of the spine, C. Posterior pa of the veebral disc, D. Posterior pa of the veebral body
B: Posterior elements of the spine
Answer: B: Posterior elements of the spine 
Explanation: Denis classificationof the structural elements of the spine: Anterior column Middle component Posterior complex Anterior pa of of the veebra and disc Anterior longitudinal ligament Posterior pa of the veebra and disc Posterior longitudinal ligament Posterior elements- pedicles, lamina, spinous processes, facet joints, and the remaining ligaments Association for the Study of Internal Fixation (ASIF) system reves back to the original two-column theory: Anterior column consisting of veebral body and disc Posterior column consisting of pedicles, laminae, facets and posterior ligamentous complex.