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Classification of the 31A2 fracture on X-ray. According to the X-ray appearance, this 31A2 fracture classification includes the 31A2.1 subgroup (A). On the three-dimensional (3-D) image of the fracture, there are more than one intermediate fragments. The 31A2 fracture can be further classified into the 31A2.2 subgroup (B), and the thick anteromedial cortex remained (C).
