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척추의 해부학적 요소를 고려한 척추경 나사못 디자인의 Pullout 특성 연구

A Study on Pullout Characteristics of Pedicle Screw Design Considering Anatomical Structure of the Lumbar Spine

Journal of Biomedical Engineering Research 2021년 42권 1호 p.1 ~ 6
유경주, 박광민, 안경기, 안윤호,
소속 상세정보
유경주 ( Yoo Kyeong-Joo ) - GBS Commonwealth Co. Ltd. R&D Center
박광민 ( Park Kwang-Min ) - Chungbuk National University Department of Biomedical Engineering
안경기 ( Ahn Kyoung-Gee ) - GBS Commonwealth Co. Ltd. R&D Center
안윤호 ( Ahn Yoon-Ho ) - GBS Commonwealth Co. Ltd. R&D Center

Abstract


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.

키워드

Pedicle screw; Pullout strength; Pullout stiffness; Single pitched thread pedicle screw; Dual pitched thread pedicle screw

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