What is the best internal fixation in pelvic fracture models with open-book injury and anterior sacroiliac joint disruption?
Abstract: The best operative
management for open-book pelvic injury with anterior sacroiliac disruption
(OTA/AO B1.1 classification) is still debated. This biomechanical study aimed
to find the best internal fixation technique for such injury.
Methods: Open-book injury with anterior sacroiliac joint disruption was
simulated on 25 artificial pelvic bones. Twenty five artificial pelvic bones
were divided into 5 groups (n=5 /group) and fixated with five different
fixation techniques: 1). 1SP+1IS; 2). 2SP; 3). 2SP+2SIP; 4). 1SP+2IS S1, and
5). 1SP+1IS S1+S2. Biomechanical properties of each fixation technique were
assessed using Tensilon® RTF-1310 to measure the resistance to translation and
load to failure. Data were statistically analyzed using one-way ANOVA followed
by post-hoc Bonferroni test.
Results: The highest mean load to failure of axial forces (1490.36 N) was
achieved by the fixation technique using one symphyseal plate and two
iliosacral screws located at S1 dan S2. The addition of one iliosacral screw
significantly increased the mean load to failure for axial compression
(p<0.05).
Conclusion: The addition of sacroiliac joint posterior fixation, either
with plate or screw, will increase the fixation biomechanical strength. Single
symphyseal plate and two iliosacral screws on S1 and S2 provided the best
mechanical resistance to axial loading. Thus, it can be concluded that such
fixation technique is best for open-book pelvic injury with anterior sacroiliac
disruption.
Keywords: anterior sacroiliac
joint disruption; biomechanical study; internal fixation; open-book injury
Author: Ismail H. Dilogo,
Immanuel P. Sitorus
Journal Code: jpkedokterangg150330