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A Pull-Out Resistant Pedicle Screw for the Osteoporotic Spine

[+] Author Affiliations
Karthik Ponnusamy, Sravisht Iyer, Alex Hui, Gaurav Gupta, Kartik Trehan, Christopher Yu

Johns Hopkins University, Baltimore, MD

A. Jay Khanna

Johns Hopkins Orthopaedics at Good Samaritan, Baltimore, MD

Paper No. BioMed2007-38050, pp. 115-116; 2 pages
  • ASME 2007 2nd Frontiers in Biomedical Devices Conference
  • ASME 2007 2nd Frontiers in Biomedical Devices
  • Irvine, California, USA, June 7–8, 2007
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4266-5 | eISBN: 0-7918-3797-1
  • Copyright © 2007 by ASME


Pedicle screws are commonly used in spine surgery to implant and affix metal devices to the spine. These screws are most commonly associated with cases that require rod or plate implantation. Use of pedicle screws in osteoporotic patients, however, is limited because they suffer from low bone mass density (BMD). The low BMD is harmful to patients in two ways — it leads to increased incidence of spinal trauma and also prevents surgeons from instrumenting osteoporotic patients because screws do not achieve the required fixation in osteoporotic patients [1]. The risk of trauma is increased due to the brittle bone and vertebral compression fractures, resulting in spinal misalignment and increased risk of future trauma. Instrumenting these cases with rods or plates, however, is impossible because osteoporotic bone is not strong enough to “hold” pedicle screws in, i.e., prevent screws from pulling out [2, 3].

Copyright © 2007 by ASME



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