Review Article

Pathoanatomic Risk Factors for Instability and Adjacent Segment Disease in Lumbar Spine: How to Use Topping Off?

Table 2

Predisposing pathoanatomic factors for ASD.

(i) Laminar horizontalization > 130°
(ii) Thoracolumbar fascia insufficiency
(iii) Facet sagittalization 52.7 to 67.1°
(iv) Loss of segmental lordosis