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A line diagram showing anterior 1/2 Jefferson fractures (a) and posterior 1/2 Jefferson fractures (b) are both Landells and Van Peteghem type I with isolated arch fractures. Semi-ring Jefferson fracture (c and d) are Landells and Van Peteghem type II, which also includes anterior 3/4 Jefferson fracture (e) and posterior 3/4 Jefferson fracture (f)
