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Classificação de Sangeorzan para fratura do navicular: sangeorzan
A: Avulsion-type fractures can involve either the talo-navicular or naviculocuneiform ligaments. B: Tuberosity fractures are
usually traction-type injuries with disruption of the tibialis posterior insertion without joint surface disruption. C: A type I body
fracture splits the navicular into dorsal and plantar segments. D: A type II body fracture cleaves it into medial and lateral
segments. The location of the split usually follows one of the two intercuneiform joint lines. Stress fractures are usually included
in this group. E: A type III body fracture is distinguished by comminution and significant displacement of the fragments.