Which statement correctly describes Type 4 pelvic fracture?

Which statement correctly describes Type 4 pelvic fracture?

• A. Double break in pelvic ring
• B. Fracture of the acetabulum
• C. Individual bone fracture
• D. Single break in pelvic ring

Answer: (B)

The statement being tested is that Type 4 pelvic fracture describes a fracture of the acetabulum. The acetabulum is the socket part of the pelvis that forms the hip joint, and an isolated fracture here is an intra-articular defect that may occur without disrupting the pelvic ring itself. In this pattern, the ring can remain intact even though the acetabulum is fractured, which distinguishes it from pelvic ring injuries that involve a single or double break in the ring itself. The other options describe disruptions of the pelvic ring (single or double breaks) or a vague “individual bone fracture” without specifying the acetabulum, which is not what Type 4 denotes.

The statement being tested is that Type 4 pelvic fracture describes a fracture of the acetabulum. The acetabulum is the socket part of the pelvis that forms the hip joint, and an isolated fracture here is an intra-articular defect that may occur without disrupting the pelvic ring itself. In this pattern, the ring can remain intact even though the acetabulum is fractured, which distinguishes it from pelvic ring injuries that involve a single or double break in the ring itself. The other options describe disruptions of the pelvic ring (single or double breaks) or a vague “individual bone fracture” without specifying the acetabulum, which is not what Type 4 denotes.