Abstract
BackgroundTo compare the stability of sacroiliac joint disruption fixed with three kinds of internal fixation using both biomechanical test and finite element analysis.MethodsFive embalmed specimens of an adult were used. The symphysis pubis rupture and left sacroiliac joint disruption were created. The symphysis pubis was stabilized with a five-hole plate. The sacroiliac joint disruption was fixed with three kinds of internal fixation in a randomized design. Displacements of the whole specimen and shifts in the gap were recorded. Three-dimensional finite element models of the pelvis, the pelvis with symphysis pubis rupture and left sacroiliac joint disruption, and three kinds of internal fixation techniques were created and analyzed.ResultsUnder the vertical load, the displacements and shifts in the gap of the pelvis fixed with minimally invasive adjustable plate (MIAP) combined with one iliosacral (IS) screw were the smallest, and the average displacements of the pelvis fixed with an anterior plate were the largest one. The differences among them were significant. In finite element analysis and MIAP combined with one IS screw fixation showed relatively best fixation stability and lowest risks of implant failure than two IS screws fixation and anterior plate fixation.ConclusionThe stability of sacroiliac joint disruption fixed with MIAP combined with one IS screw is better than that fixed with two IS screws and anterior plate under vertical load.
Highlights
To compare the stability of sacroiliac joint disruption fixed with three kinds of internal fixation using both biomechanical test and finite element analysis
1 minimally invasive adjustable plate (MIAP) combined with one IS screw; 2 two IS screws; 3 anterior plate two appropriate 7.3-mm cannulated, partially threaded, and cancellous IS screws were inserted along these wires simultaneously (Fig. 3). (3) Anterior plate group: The anterior plate was bent according to the anterior structure of Sacroiliac joints (SIJs)
The average displacements of the pelvis fixed with MIAP combined with one IS screw were the smallest, and the average displacements of the pelvis fixed with an anterior plate were the largest one
Summary
To compare the stability of sacroiliac joint disruption fixed with three kinds of internal fixation using both biomechanical test and finite element analysis. Sacroiliac joint disruption (SJD) is a severe clinical injury, caused by high-energy traumas. There are several internal fixation techniques for SJD, including percutaneous iliosacral (IS) screw, anterior plate, posterior transiliac plating, minimally invasive adjustable plate (MIAP), and so on [3,4,5]. These fixations have several advantages and disadvantages respectively, and none is proved to be the strongest fixation in the experiments and clinics. Osterhoff et al treated the patients with unstable pelvic fracture using IS screws and found that IS screw fixation was a
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