- Spontaneous Reduction Finding: Magnetic Resonance Imaging Evaluation of Segmental Instability in Spondylolisthesis

Measurement of sagittal translation and sagittal angulation. Sagittal translation (%): The length between D and E/the length between C and E ×100, Sagittal angulation (°): θ is angle between AB line and CE line, A: Anterior margin of lower endplate of superior vertebra, B: Posterior margin of lower endplate of superior vertebra, C: Anterior margin of upper endplate of inferior vertebra, D: Crossing point between CE line and the perpendicular line to CE line from B E: Posterior margin of upper endplate of inferior vertebra.