Spondylolisthesis

Spondylolisthesis occurs when the pars defect (spondylolysis) is bilateral allowing forward displacement (subluxation) of the rostral vertebra. Clinically significant spondylolisthesis (grade 2–4) is best identified on lateral radiographs, and instability can be documented during maximum flexion and extension views. It usually occurs at L5 to S1 level.

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