What is the appropriate imaging modality in this case?
CT is best suited to investigate small bowel obstruction. Although AXR can show obstruction, CT can usually identify the cause. Ideally these scans would be performed with contrast (as long as renal function is sufficient) to better visualise bowel wall and solid organs.
What are the common causes of small bowel obstruction?
SBO is usually secondary to adhesions or hernias. Other causes include volvulus, tumours, inflammation and luminal obstruction - but the first two are most common.
Multiple distended small bowel loops (positioned centrally, valvulae conniventes present).
Left hip arthroplasty noted.