The effect of different insertion points on the security of pedicle screw fixation in bovine vertebrae.

Study Design: Cyclic loading of pedicle screws inserted into bovine vertebrae was applied and the security of fixation was assessed as a function of the point of insertion of the screws.

Objective: To determine which point of insertion is associated with more secure fixation using 2 commonly selected insertion points.

Summary Of Background Data: The strength of pedicle screw fixation depends on several factors, some of these have been studied.