- Discussion: - allow control of
Anterior column via a posterior approach; - provide 4 point fixation; - reduce the number of levels that must be incorporated in the construct; - this is a particular adavantage in the lower lumbar spine; - screws provide lever arms, which facilitate reduction maneuvers and allow lordosis to be maintained; - allows saggital plane correction; - because limitations are imposed by pedicle diameter, these systems are best used for L2 to L5 levels;
