Comparison of the accuracy of radiography and ultrasonography for detection of articular lesions in horses.
Authors: Hinz Antje, Fischer Andrew T
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Radiography vs Ultrasonography for Equine Articular Lesions Hinz and Fischer (2011) evaluated the comparative diagnostic value of ultrasonography and radiography against the gold standard of arthroscopic findings in 137 horses presenting with articular pathology across 254 joints. Ultrasonographic examination demonstrated markedly superior accuracy (82.9%) and sensitivity (91.4%) compared to radiography (62.2% accuracy, 66.7% sensitivity), with the difference highly statistically significant (P < 0.0001), though specificity values were comparable between modalities. Of the 432 lesions identified arthroscopically, ultrasonography's higher sensitivity translated to a substantially better negative predictive value (31.5% versus 13.2%), meaning a negative ultrasound finding carries considerably more diagnostic weight than a negative radiograph in ruling out intra-articular pathology. These findings have direct implications for clinical decision-making: whilst radiography remains valuable for detecting bone involvement and bony proliferation, ultrasonography should be prioritised as the first-line imaging modality for suspicious intra-articular soft-tissue lesions, potentially reducing unnecessary arthroscopic procedures and enabling more precise pre-surgical planning when arthroscopy is indicated.
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Practical Takeaways
- •Ultrasonography is significantly more accurate than radiography for detecting articular lesions and should be the preferred imaging modality when joint pathology is suspected
- •A negative ultrasound finding is more reliable than a negative radiograph for ruling out intra-articular lesions, though arthroscopy remains the gold standard for definitive diagnosis
- •Both imaging modalities have similar specificity, so positive findings on either technique warrant further investigation with arthroscopy
Key Findings
- •Ultrasonography demonstrated 82.9% overall accuracy for detecting articular lesions compared to 62.2% for radiography (P < 0.0001)
- •Ultrasonography showed 91.4% sensitivity versus 66.7% for radiography (P < 0.0001) when lesions were confirmed by arthroscopy
- •Ultrasonography had negative predictive value of 31.5% versus 13.2% for radiography (P = 0.0022)
- •No statistically significant difference in specificity between ultrasonography and radiography (P = 0.2628)