Hounsfield units of the vertebral body and pedicle as predictors of pedicle screw loosening after degenerative lumbar spine surgery

The Effect of Vertebral Body Geometry on Pedicle Screw Fixation Biomechanics in Human Lumbar Spine

Ata M. Kiapour, Ph.D., Laura E. Buckenmeyer, M.S., Kristophe J. Karami, D.O., Vijay K. Goel, Ph.D., Teck M. Soo, M.D., Constantine K. Demetropoulos, PhD. Boston Children's Hospital, Harvard Medical School, Boston, MA, USA, University of Toledo, Toledo, OH, USA, Johns Hopkins University, Baltimore, MD, USA, St John Providence Hospital, Southfield, MI, USA, Johns Hopkins University, Laurel, MD, USA.

Intraoperative biomechanics of lumbar pedicle screw loosening following successful arthrodesis.

Pedicle screw loosening has been implicated in recurrent back pain after lumbar spinal fusion, but the degree of loosening has not been systematically quantified in patients. Instrumentation removal is an option for patients with successful arthrodesis, but remains controversial. Here, we quantified pedicle screw loosening by measuring screw insertion and/or removal torque at high statistical p...

Pedicle Screw Fixation in Fracture of Thoraco-lumbar Spine

Pedicle screw fixation in the spine.

In August 1993, in the USA, an FDA advisory committee of experts reviewed the scientific data on pedicle screws and decided that not enough was known about the shortterm problems or the long-term safety and effectiveness of these devices to allow their use to be approved. Manufacturers were therefore forbidden to promote the use of screws in the spine, and patients were warned that pedicle scre...

Pedicle screw malposition following spinal lumbar injury

Pedicle screws are the main type of instrumentation used in the lumbar spine via the posterior approach. The accuracy of their insertion is always a concern because the malposition of screws is associated with a potential risk of iatrogenic injury of any neurovascular structure they pass. Fortunately, spinal cord and cauda equina injuries are rare. This 18-year-old paraplegic woman presented mo...