Pinheiro Rômulo Pedroza, Miranda Raffaello de Freitas, Shimano Antonio Carlos, Chandanson Thibault, George Keri, Defino Helton L A
Setor de Cirurgia da Coluna, Departamento de Ortopedia e Anestesiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.
Département Génie Mécanique et Conception, Université de Technologie de Belfort, Montbéliard, França.
Rev Bras Ortop (Sao Paulo). 2022 Jan 21;57(2):327-333. doi: 10.1055/s-0041-1732390. eCollection 2022 Apr.
We aimed to study the "in vitro" pullout strength of SpineGuard/Zavation Dynamic Surgical Guidance Z-Direct Screw (DSG Screw, SpineGuard Inc, Boulder, Colorado, USA), a screw designed to be inserted using a direct insertion technique. Dynamic Surgical Guidance Screws of 5.5 and 6.5 mm were introduced into polyurethane blocks with a density of 10 PCF (0,16g/cm ). According to the experimental group, screws were inserted without pilot hole, with pilot without tapping, undertapping and line-to-line tapping. Screw pullout tests were performed using a universal test machine after screw insertion into polyurethane blocks. Screws inserted directly into the polyurethane blocks without pilot hole and tapping showed a statistically higher pullout strength. Insertion of the screw without tapping or with undertapping increases the pullout screw strength compared with line-to-line tapping. Dynamic Surgical Guidance Screw showed the highest pullout strength after its insertion without pilot hole and tapping.
我们旨在研究SpineGuard/Zavation动态手术导向Z型直螺钉（DSG螺钉，美国科罗拉多州博尔德市的SpineGuard公司）的“体外”拔出强度，该螺钉设计用于采用直接插入技术进行植入。将5.5毫米和6.5毫米的动态手术导向螺钉植入密度为10 PCF（0.16克/立方厘米）的聚氨酯块中。根据实验组，螺钉植入时不钻导向孔、钻导向孔但不攻丝、攻丝不足以及逐行攻丝。将螺钉植入聚氨酯块后，使用万能试验机进行螺钉拔出试验。直接植入聚氨酯块且不钻导向孔和攻丝的螺钉显示出统计学上更高的拔出强度。与逐行攻丝相比，不攻丝或攻丝不足时植入螺钉可提高螺钉拔出强度。动态手术导向螺钉在不钻导向孔和不攻丝植入后显示出最高的拔出强度。
