Spinal fixation is a widely used solution for patients who suffer from vertebral fractures, vertebrectomy, and scoliosis [1]. Although there are existing fixation techniques, frequently used method for spinal fixation is the use of pedicle screws [2]. Durability of fixation is important for life quality of patient. Biomechanical performance of fixation systems plays a major role in this manner. Pullout strength is one of the most important parameters that effect durability of fixation. It depends on several factors such as core geometry, size, bone mineral density (BMD), pitch design, etc. Conical screw cores provide higher pullout strength than cylindrical screw cores. In addition, as much as diameter of screw increases, pullout strength is also increases. BMD is another key factor in terms of pullout strength. Researches revealed that denser bone mediums maintain greater pullout strength, thus screw loose situations are mostly seen on osteoporotic patients. Since...
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TOBB University of Economics and Technology,
TOBB University of Economics and Technology,
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June 2014
Technical Briefs
New Pedicle Screw Design With Expandable Shell for Low Bone Quality1
Teyfik Demir,
TOBB University of Economics and Technology,
Teyfik Demir
Department of Mechanical Engineering
,TOBB University of Economics and Technology,
Ankara 06510
, Turkey
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Mehmet F. Örmeci
TOBB University of Economics and Technology,
Mehmet F. Örmeci
Department of Mechanical Engineering
,TOBB University of Economics and Technology,
Ankara 06510
, Turkey
Search for other works by this author on:
Teyfik Demir
Department of Mechanical Engineering
,TOBB University of Economics and Technology,
Ankara 06510
, Turkey
Mehmet F. Örmeci
Department of Mechanical Engineering
,TOBB University of Economics and Technology,
Ankara 06510
, Turkey
DOI: 10.1115/1.4026997
Manuscript received February 21, 2014; final manuscript received March 3, 2014; published online April 28, 2014. Editor: Arthur G. Erdman.
J. Med. Devices. Jun 2014, 8(2): 020935 (2 pages)
Published Online: April 28, 2014
Article history
Received:
February 21, 2014
Revision Received:
March 3, 2014
Citation
Demir, T., and Örmeci, M. F. (April 28, 2014). "New Pedicle Screw Design With Expandable Shell for Low Bone Quality." ASME. J. Med. Devices. June 2014; 8(2): 020935. https://doi.org/10.1115/1.4026997
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