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Evaluation items were intervertebral angle; % slippage; intervertebral disc area ratio in flexion–extension X-ray imaging. Intervertebral angle: θ; % slip: S/W×100; intervertebral disc area ratio: BDEF/ABCD×100. % Slip: percentage of the slip distance to longitudinal diameter of the vertebral body; intervertebral disc area ratio: ratio of area of sliding intervertebral disc to sliding vertebra.
