"Type A"
"Type B"
"Type C"
"A1: Avulsion injury"
"A2: Iliac-wing or anterior-arch fracture due to a direct blow"
"A3: Transverse sacrococcygeal fracture"
"B1: Open-book injury (external rotation)"
"B2: Lateral-compression injury (internal rotation)"
"B2-1: Ipsilateral anterior and posterior injuries"
"B2-2: Contralateral (bucket-handle) injuries"
"B3: Bilateral"
"C1: Unilateral"
"C1-1: Iliac fractureC1-2: Sacroiliac fracture-dislocation"
"C1-1: Iliac fractureC1-2: Sacroiliac fracture-dislocation"
"C1-3: Sacral fracture"
Expected headings
"Type A"
"Type B"
"Type C"