Comparison of the Accuracy of Radiography and Ultrasonography for Detection of Articular Lesions in Horses

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Abstract
Objective: To compare the accuracy of ultrasonographic and radiographic examination for evaluation of articular lesions in horses.Study Design: Cross‐sectional study.Animals: Horses (n= 137) with articular lesions.Methods: Radiographic and ultrasonographic examinations of the affected joint(s) were performed before diagnostic or therapeutic arthroscopic surgery. Findings were recorded and compared to lesions identified during arthroscopy.Results: In 254 joints, 432 lesions were identified by arthroscopy. The overall accuracy was 82.9% for ultrasonography and 62.2% for radiography (P< .0001) with a sensitivity of 91.4% for ultrasonography and 66.7% for radiography (P< .0001). The difference in specificity was not statistically significant (P= .2628). The negative predictive value for ultrasonography was 31.5% and 13.2% for radiography (P= .0022), the difference for the positive predictive value was not statistically significant (P= .3898). The accuracy for ultrasonography and radiography for left versus right joints was equal and corresponded with the overall results.Conclusions: Ultrasonographic evaluation of articular lesions was more accurate than radiographic evaluation.

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