This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Radiological factors indicating an unstable pelvis are all except ? 
Select and explain. 
A. Posterior sacroiliac complex displacement by > 1 cm, B. Avulsion fracture of sacral or ischial end of the sacrospinous ligament, C. Avulsion fractures of the L5 transverse process, D. Isolated disruption of pubic symphysis with pubic diastasis of 2 cm.
D: Isolated disruption of pubic symphysis with pubic diastasis of 2 cm.
Answer: D: Isolated disruption of pubic symphysis with pubic diastasis of 2 cm. 
Explanation: Ans. is 'd' i.e., Isolated disruption of pubic symphysis with pubic diastasis of 2 cm Radiographic factors indicating unstable pelvis are :- Posterior sacroiliac complex displacement by > lcm Avulsion fracture of sacral or ischial end of the sacrospinous ligament Avulsion fractures of the L5 transverse process Disruption of pubic symphysis with pubic diastasis of 2 cm with posterior pelvic injury or injury to anterior/ posterior sacroiliac ligament or sacrospinous ligaments. Presence of gap rather than impaction in the posterior pelvic ring.