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A Novel Blasted and Grooved Low Profile Pedicle Screw Able to Resist High Compression Bending Loads

 Sung-Uk Kuh  ;  Young-Sung Kim  ;  Hong-June Choi  ;  Kyung-Hyun Kim  ;  Jeong-Yoon Park  ;  Hyun-Yong Jeong  ;  Dong-Kyu Chin  ;  Keun-Su Kim  ;  Young-Sul Yoon  ;  Yoon-Chul Lee  ;  Yong-Eun Cho 
 Korean Journal of Spine (대한척추신경외과학회지), Vol.9(2) : 61-65, 2012 
Journal Title
 Korean Journal of Spine  (대한척추신경외과학회지) 
Issue Date
Objective: Objective: Polyaxial pedicle screws are a safe, useful adjunct to transpedicular fixation. However, the large screw head size can cause soft tissue irritation, high rod positioning, and facet joint injury. However, the mechanical resistance provided by small and low profile pedicle screws is very limited. We therefore developed a novel, low profile pedicle screw using grooving and blasting treatment that is able to resist a high compression bending load. Methods: We evaluated the compression bending force to displacement and yield loads for seven different screw head types that differed with regard to their groove intervals and whether or not they had been blasted. Results: The rank order of screw types that had the greatest compression bending force to displacement was as follows: (1) universal polyaxial, (2) low polyaxial with 0.1mm grooves and blasting, (3) low polyaxial with blasting, (4) low polyaxial with 0.15mm grooves and blasting, (5) low polyaxial with 0.05mm grooves and blasting, (6) low polyaxial with 0.05mm grooves, (7) and low polyaxial. Low polyaxial screws with 0.1mm grooves and blasting had the maximum yield load and highest compression bending force to displacement of all seven polyaxial screw head systems evaluated. Conclusion: Blasting and grooving treatment of pedicle screw heads resulted in screw heads with a high yield load and compression bending force relative to displacement because of increased friction. Low polyaxial pedicle screws with 0.1 mm grooves treated by blasting have mechanical characteristics similar to those of universal polyaxial pedicle screws.
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1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Neurosurgery (신경외과학교실)
Yonsei Authors
구성욱(Kuh, Sung Uk) ORCID logo https://orcid.org/0000-0003-2566-3209
김경현(Kim, Kyung Hyun)
김근수(Kim, Keun Su)
김영성(Kim, Young Sung)
박정윤(Park, Jeong Yoon) ORCID logo https://orcid.org/0000-0002-3728-7784
윤영설(Yoon, Young Sul)
조용은(Cho, Yong Eun)
진동규(Chin, Dong Kyu)
최홍준(Choi, Hong Jun)
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