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Updated: Jul 10, 2025

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Indications for computed tomography angiography in limb trauma.

Wasim Awal1,2, Julia De Groot1,2

  • 1Sunshine Coast University Hospital, Sunshine Coast, Queensland, Australia.

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|November 20, 2023
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Summary

Computed tomography angiograms (CTAs) for limb trauma are indicated by hard signs of vascular compromise or an arterial pressure index (API) <0.9. Soft signs may guide API testing, and CTAs are not routinely needed for knee dislocations.

Keywords:
computed tomography angiographyemergency medicineradiologytraumavascular injuries

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Area of Science:

  • Radiology
  • Vascular Surgery
  • Trauma Surgery

Background:

  • Computed tomography angiograms (CTAs) are crucial for diagnosing vascular injury in limb trauma.
  • Current guidelines lack consensus on CTA indications, leading to overuse and potential patient harm.
  • Defining appropriate CTA indications in limb trauma is essential for optimizing patient care.

Purpose of the Study:

  • To establish clear indications for utilizing CTAs in patients with limb trauma.
  • To reduce unnecessary CTA utilization and associated risks.
  • To correlate clinical findings with CTA-detected vascular injuries.

Main Methods:

  • Retrospective cohort study of 49 consecutive CTAs performed between January and December 2022.
  • Collected demographic and clinical data, including physical examination findings (hard and soft signs) and arterial pressure index (API).
  • Analyzed correlations between clinical factors and CTA-confirmed vascular injuries.

Main Results:

  • Vascular injury was detected in 10.2% of CTAs.
  • Hard signs (e.g., absent pulse) and API <0.9 were significantly correlated with vascular injury (P < 0.001 and P = 0.02, respectively).
  • API measurement showed 100% sensitivity and specificity; hard signs had 90% sensitivity and 82% specificity. Soft signs had 100% sensitivity but poor specificity. Knee dislocations were not associated with vascular injury (P = 0.5).

Conclusions:

  • CTAs are indicated for limb trauma in hemodynamically stable patients with hard signs of vascular compromise or an API <0.9.
  • Soft signs can help identify patients who would benefit from API measurement.
  • Routine CTAs for knee dislocations may not be necessary.