Diagnostic Performance of Multi-Detector Computed Tomography Arthrography and 3-Tesla Magnetic Resonance Imaging to Diagnose Experimentally Created Articular Cartilage Lesions in Equine Cadaver Stifles.
Authors: Bolz Nico M, Sánchez-Andrade José Suárez, Torgerson Paul R, Bischofberger Andrea S
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Diagnosing early cartilage damage in equine stifles remains challenging, and this 2023 cadaver study compared two advanced imaging techniques—computed tomographic arthrography (CTA) and 3-Tesla MRI—to evaluate their ability to detect experimentally created cartilage lesions across both femorotibial and femoropatellar joints. The researchers created 79 defects in 15 cadaver stifles using arthroscopic techniques, with lesions ranging from 2–54 mm² in surface area, and had a blinded radiologist evaluate CTA and MRI images against anatomical findings. Both modalities showed similar sensitivity (CTA 53% versus MRI 66%, not statistically significant), but CTA demonstrated significantly superior specificity (66% versus 52%), meaning it was more reliable at correctly identifying normal cartilage and avoiding false positives. Critically, lesion size was a limiting factor for both techniques—smaller defects were substantially harder to detect—though CTA showed improved detection rates as lesion surface area increased, a trend not observed with MRI. For equine practitioners, these results suggest CTA offers a practical advantage over high-field MRI in ruling out cartilage pathology and may be preferred where availability and ease of image acquisition are considerations, though clinicians should remain aware that both modalities have limited sensitivity for early or small cartilage lesions that warrant direct arthroscopic visualisation.
Read the full abstract on PubMed
Practical Takeaways
- •CTA may be preferred over MRI in clinical practice due to higher specificity (fewer false positives), greater availability, and easier acquisition for diagnosing equine stifle cartilage disease
- •Both imaging modalities struggle with detection of small cartilage lesions (<11 mm²), so negative imaging results should not definitively rule out early cartilage damage
- •CTA's superior specificity means fewer normal stifles will be incorrectly identified as having cartilage damage, reducing unnecessary treatment decisions
Key Findings
- •CTA and MRI showed similar sensitivity (53% vs 66%, p=0.09) for detecting artificial cartilage lesions in equine stifles
- •CTA demonstrated significantly higher specificity (66%) compared to MRI (52%, p=0.04), making it more accurate for diagnosing normal cartilage
- •Lesion surface area was a critical factor; larger defects (mean 11 mm²) were more likely detected with CTA but not MRI
- •Small lesion size was a discriminating factor limiting detection performance for both imaging modalities