Schmierer Philipp A, Smolders Lucas A, Zderic Ivan, Gueorguiev Boyko, Pozzi Antonio, Knell Sebastian C
Clinic for Small Animal Surgery, Vetsuisse Faculty University of Zurich, Zurich, Switzerland.
AO Research Institute Davos, Davos, Switzerland.
Vet Surg. 2019 Jan;48(1):88-95. doi: 10.1111/vsu.13124. Epub 2018 Nov 13.
To determine the biomechanical properties of plating techniques for comminuted feline ilial fractures.
Ex vivo study on 40 paired feline hemipelves.
Forty paired fresh-frozen hemipelves that had been collected from 20 cats aged 2-6 years and weighing 4.0-5.5 kg.
A transverse 3-mm gap was created in each ilium. Hemipelves were fixed with one of the following methods (n = 10 per group): (1) a dorsal plate and nonlocking screws, (2) a lateral plate and nonlocking screws, (3) a lateral plate and locking screws, or (4) a lateral and dorsal locking compression plate using nonlocking screws. Each specimen was subjected to incremental, sinusoidal cyclic loading until failure, defined as 10-mm displacement. The initial stiffness and number of cycles required to reach 1-, 2-, 5-, and 10-mm axial displacement were statistically analyzed.
The initial stiffness and number of cycles to failure were higher in specimens fixed with double nonlocking plates than in all other fixations (P < .05) except specimens fixed with lateral locking plate at 10-mm displacement (P = .44). Locking implants withstood more cycles to 5- (P < .05) and 10-mm (P < .05) displacement compared with other single-plate nonlocking groups. Screw loosening occurred only in the 3 nonlocking fixations.
Double plating improved stiffness and resistance to failure of comminuted feline ilial fracture constructs compared with all other fixations. Single locking plates produced superior constructs compared with single nonlocking constructs.
Locking implants are recommended to repair comminuted feline ilial fractures for their extended fatigue life and resistance to screw loosening. Orthogonal plating offers a strong nonlocking alternative.
确定用于猫科动物粉碎性髂骨骨折的接骨板技术的生物力学特性。
对40对猫半骨盆进行体外研究。
从20只年龄在2至6岁、体重4.0至5.5千克的猫身上采集的40对新鲜冷冻半骨盆。
在每侧髂骨上制造一个3毫米的横向间隙。半骨盆采用以下方法之一固定（每组n = 10）：（1）一块背侧接骨板和非锁定螺钉，（2）一块外侧接骨板和非锁定螺钉，（3）一块外侧接骨板和锁定螺钉，或（4）一块外侧和背侧锁定加压接骨板并用非锁定螺钉。每个标本承受递增的正弦循环载荷直至失效，失效定义为位移10毫米。对达到1、2、5和10毫米轴向位移所需的初始刚度和循环次数进行统计分析。
与所有其他固定方式相比，用双非锁定接骨板固定的标本的初始刚度和失效循环次数更高（P < 0.05），但在10毫米位移时用外侧锁定接骨板固定的标本除外（P = 0.44）。与其他单接骨板非锁定组相比，锁定植入物在5毫米（P < 0.05）和10毫米（P < 0.05）位移时能承受更多循环。螺钉松动仅发生在3种非锁定固定方式中。
与所有其他固定方式相比，双接骨板固定可提高猫科动物粉碎性髂骨骨折结构的刚度和抗失效能力。与单非锁定结构相比，单锁定接骨板产生的结构更优。
由于锁定植入物具有更长的疲劳寿命和抗螺钉松动能力，因此建议用于修复猫科动物粉碎性髂骨骨折。正交接骨板提供了一种强大的非锁定替代方案。
