Fig. 4From: Finite element analysis comparing a PEEK posterior fixation device versus pedicle screws for lumbar fusionMoment-rotation curve in flexion–extension with the cortico-pedicular posterior fixation (CPPF) device, pedicle screw system (PSS), and intact spine at one or two operated segments. At a pure moment of 7.5 Nm, flexion–extension between the CPPF device and PSS was within 0.5 degrees under all loading conditionsBack to article page