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. 2015 Feb 15;8(2):1853-61.
eCollection 2015.

Biomechanical comparison of three types of internal fixation in a type C zone II pelvic fracture model

Tao Wu  1 , Wei Chen  1 , Xu Li  1 , Qi Zhang  1 , Hong-Zhi Lv  1 , Ying-Ze Zhang  1
Affiliations

Biomechanical comparison of three types of internal fixation in a type C zone II pelvic fracture model

Tao Wu et al. Int J Clin Exp Med. .

Abstract

Objective: This study aimed to compare the stability of Tile C pelvic fractures fixed with two iliosacral (IS) screws, tension band plate (TBP), and minimally invasive adjustable plate (MIAP).

Methods: Six embalmed specimens of adult pelvis were used. The soft tissue was removed from the specimens, but spines from the fourth lumbar vertebra to the proximal one-third of both femurs were retained. The pubic symphysis, bilateral sacroiliac joints and ligaments, bilateral hip joints, bilateral sacrotuberous ligaments, and bilateral sacrospinous ligaments were intact. Tile C pelvic fractures were created on the specimens. The symphysis pubis was fixed with a plate, and the fracture on the posterior pelvic ring was fixed with three types of internal fixation in a randomized block design. The specimens were placed in a biomechanical machine at a standing neutral posture. A cyclic vertical load of up to 500N was applied, and displacement was recorded. Shifts in the fracture gap were measured by a grating displacement sensor.

Results: Under different vertical loads, the shift in the fracture gap and displacement of the pelvic fractures fixed with two IS screws were similar to those in fractures fixed with MIAP. However, the shift in the fracture gap and displacement of fractures fixed with MIAP was significantly smaller than those of fractures fixed with TBP.

Conclusion: The stability of the Tile C pelvic fractures fixed with MIAP was similar to that of fractures fixed with IS screws. MIAP performed better than TBP under vertical load.

Keywords: Pelvis; biomechanics; internal fixation; unstable.

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Figures

Figure 1
Figure 1
Structure of MIAP for posterior pelvic ring injury.
Figure 2
Figure 2
Image of the specimen after creating an unstable type C zone II vertically oriented injury with incision on the symphysis pubis.
Figure 3
Figure 3
Posterior pelvic ring fixed with two IS screws. A. Posterior view of the specimen. B. Outlet radiograph of the pelvis.
Figure 4
Figure 4
Posterior pelvic ring fixed with TBP. A. Posterior view of the specimen. B. Anteroposterior radiograph of the pelvis.
Figure 5
Figure 5
Posterior pelvic ring fixed with MIAP. A. Posterior view of the specimen and grating displacement sensor. B. Anteroposterior radiograph of the pelvis.
Figure 6
Figure 6
Load-displacement scattergraph of the specimens indicates that the deformation of specimens was elastic.
See this image and copyright information in PMC

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