In patients post-appendicectomy with abdominal pain, distension, and constipation, does a CT abdomen and pelvis with contrast effectively diagnose small bowel obstruction compared to CT abdomen and pelvis with contrast and abdominal x-ray?

No direct evidence for CT with contrast versus CT with contrast and X-ray for diagnosing SBO post-appendicectomy. CT abdomen and pelvis with contrast is the preferred imaging modality due to its detailed anatomical information and higher diagnostic accuracy.