Figure 1From: Topping-off technique prevents aggravation of degeneration of adjacent segment fusion revealed by retrospective and finite element biomechanical analysis Lateral and posterior aspects of the PLIF and Topping-off models. (1) Lateral aspect of PLIF. (2) Posterior aspect of PLIF. (3) Lateral aspect of Topping-off. (4) Posterior aspect of Topping-off.Back to article page