• C M A van Zwienen, E W van den Bosch, C J Snijders, G J Kleinrensink, and A B van Vugt.
• Biomedical Physics and Technology, Erasmus University Rotterdam, Rotterdam, The Netherlands.
• J Orthop Trauma. 2004 Oct 1; 18 (9): 589-95.

ObjectiveTo determine the stiffness and strength of various sacroiliac screw fixations to compare different sacroiliac screw techniques.DesignRandomized comparative study on embalmed human pelvises.Materials And MethodsIn 12 specimens, we created a symphysiolysis and sacral fractures on both sides. Each of these 24 sacral fractures was fixed with 1 of the following methods: 1 sacroiliac screw in the vertebral body of S1, 2 screws convergingly in S1, or 1 screw in S1 and 1 in S2. On the left and right side of a pelvis, different techniques were used. The pubic symphysis was not stabilized. We measured the translation and rotation stiffness of the fixations and the load to failure using a 3-dimensional video system.ResultsThe stiffness of the intact posterior pelvic ring was superior to any screw technique. Significant differences were found for the load to failure and rotation stiffness between the techniques with 2 screws and a single screw in S1. The techniques utilizing 2 screws showed no differences.ConclusionsBased on the results of this study, we can conclude that a second sacroiliac screw in completely unstable pelvic fractures increases rotation stiffness and improves the load to failure.Copyright 2004 Lippincott Williams & Wilkins

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