Table 3.

Analysis of the 2018 AO/OTA type-B pelvic ring injury group addressing the changes of injury mechanisms, instability patterns, and change of hierarchy [16,24, 38]

B1: Incomplete disruption of posterior arch, no rotational instability:

B1.1: Lateral compression fracture (LC1) = Tile B2

B1.2: Open book fracture (APC1) = Tile B1

B2: Incomplete disruption of posterior arch, rotationally unstable, unilateral posterior injury

B2.1: Lateral sacral compression fracture + internal rotation instability (LC1) = Tile B2

B2.2: Lateral compression fracture of the ilium (crescent type) with internal rotation instability (LC2) = Tile C?

B2.3: Open book or external rotation instability (APC2) = Tile B1

B3: Incomplete disruption of posterior arch, rotationally unstable, bilateral posterior injury

B3.1: Internal rotation instability on one side and external rotation instability on the contralateral side (LC3) = Tile B3

B3.2: Bilateral lateral compression (LC) sacral fracture (LC1) = Tile B3

B3.3: Bilateral open book (APC2) = Tile B3