What is the role of radiography in the workup of foot fractures?

Updated: Sep 23, 2018
  • Author: Robert Silbergleit, MD; Chief Editor: Trevor John Mills, MD, MPH  more...
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Answer

Ottawa foot rules are a tool that predicts significant midfoot fractures. They are guidelines used to determine whether radiographs are necessary. [12] If any of the following are present, a radiograph is required: point tenderness over the base of fifth metatarsal; point tenderness over the navicular bone;iInability to take 4 steps, both immediately after injury and in the ED.

Although developed and validated in adults, the Ottawa foot rule also appears to be a reliable tool to exclude fractures in children 5 years of age and older. [16] When performed, a systematic approach to reading foot radiographs is important and reduces the risk of missing important injuries. [17]

In a study by Pires et al, the Ottawa ankle rules showed a high reliability for determination of when to take radiographs in patients with foot or ankle sprains. Weight-bearing inability was found to be the most important isolated item to predict the presence of a fracture (69.4% sensitivity, 61.6% specificity, 63.1% accuracy, 21.9% positive predictive value, and 93% negative predictive value). Orthopedic surgeon subjective analysis had a 55.6% sensitivity, 90.1% specificity, 46.5% positive predictive value, and 92.9% negative predictive value. The general orthopedic surgeon opinion accuracy was 85.4%. The Ottawa ankle rules presented 97.2% sensitivity, 7.8% specificity, 13.9% positive predictive value, 95% negative predictive value, and 19.9% accuracy. [18]


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