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척추의 해부학적 요소를 고려한 척추경 나사못 디자인의 Pullout 특성 연구
유경주,박광민,안경기,안윤호,Yoo, Kyeong-Joo,Park, Kwang-Min,Ahn, Kyoung-Gee,Ahn, Yoon-Ho 대한의용생체공학회 2021 의공학회지 Vol.42 No.1
Recently, various types of pedicle screws have been developed considering the anatomical structure of the spine. The purpose of this study was to evaluate the pullout stiffness and strength of two types of commercial pedicle screws. The design of two type screws were single pitched thread (ST) pedicle screw and dual pitched thread (DT) pedicle screw, respectively. The tests were conducted in accordance with the ASTM standards using polyurethane (PU) test blocks which has anatomical structure of the spine. There was no significant difference in pullout stiffness between two types of screw. However, DT exhibited higher pullout strength than ST (p<0.05). Pedicle screw with dual pitched thread showed higher pullout strength without decrease in pullout stiffness compared to the standard pedicle screw. In conclusion, dual pitched thread design of the pedicle screw is considered to be more suitable than the single pitched thread for the anatomical structure of the spine.