A Malgaigne fracture is a vertical shear injury on one side of the pelvis with disruption of both the anterior and posterior pelvic rings. It consists of a fracture through the ilium and ipsilateral pubic rami, or a dislocation of the sacroiliac joint and the pubic symphysis, or any combination of these. The acetabulum is the lateral fragment and is unstable.
The case above shows fractures through the left inferior and superior pubic rami and widening of the ipsilateral sacroiliac joint. The widening of the sacroiliac joint is most likely positional, but illustrates the point.
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