Orthopaedics Radiological factors indicating an unstable pelvis are all except 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. 💡 Explanation Radiological factors indicating an unstable pelvis are all except ✓ Correct Answer: D. Isolated disruption of pubic symphysis with pubic diastasis of 2 cm.