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Table 1 OTA/AO classification of pelvic fracture

From: Factors predicting the need for hemorrhage control intervention in patients with blunt pelvic trauma: a retrospective study

Type

Description

Type A: Stable – posterior arch is intact

A1: Fracture does not involve the pelvic ring (avulsion fracture or fracture of the iliac wing)

- A1.1: Iliac spine

- A1.2: Iliac crest

- A1.3: Ischial tuberosity

A2: Stable or minimally displaced fracture of the pelvic ring

- A2.1: Iliac wing fractures

- A2.2: Unilateral fracture of anterior arch

- A2.3: Bifocal fracture of anterior arch

A3: Transverse fracture of the sacrum

- A3.1: Sacrococcygeal dislocation

- A3.2: Sacrum undisplaced

- A3.3: Sacrum displaced

Type B: Rotationally unstable, vertically stable – incomplete disruption of the posterior arch

B1: Open book injury (external rotation)

- B1.1: Sacroiliac joint, anterior disruption

- B1.2: Sacral fracture

B2: Lateral compression injury (internal rotation)

- B2.1: Anterior compression fracture, sacrum

- B2.2: Partial sacroiliac joint fracture, subluxation

- B2.3: Incomplete posterior iliac fracture

B3: Bilateral type B fracture

- B3.1: Bilateral open book fracture

- B3.2: Open book fracture and lateral compression

- B3.3: Bilateral lateral compression

Type C: Rotationally and vertically unstable – complete disruption of the posterior arch

C1: Unilateral fracture

- C1.1: Fracture of the iliac bone

- C1.2: Sacroiliac dislocation and/or fracture dislocation

- C1.3: Sacral fracture

C2: Bilateral fracture with one side type B fracture (rotationally unstable) and one side type C fracture (vertically unstable)

C3: Bilateral fracture with both sides type C fracture (both sides completely unstable)

  1. OTA/AO Orthopedic Trauma Association/Arbeitsgemeinschaft fur Osteosynthesefragen.