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Sacral fracture typing by Denis. (a) Denis I, II and III zones of the sacrum (a1 anterior view, a2 posterior view); (b) a case (male, age 38) of a Denis II type left sacral fracture treated with percutaneous PTMP (b1 anteroposterior X-ray, b2 transverse plane CT scan); (c) a case (male, age 25) of a Denis II type right sacral fracture and a case (male, age 36) of Denis I type right sacral fracture both treated with percutaneous SIJS (anteroposterior X-ray).
