56-year-old man with lower back pain. History of lumbar fusion at outside hospital in 2013. Again seen are posterior spinal fixation rods with bilateral pedicle screws in the L3, L4, L5 and S1 vertebral bodies. Hardware loosening, described on recent MRI and CT studies, is not appreciated radiographically. There is no evidence of instability on flexion and extension views.
No evidence of lumbar spinal instability.