Ultrasonographic investigation of the atlanto-occipital articulation in the horse.
Authors: Gollob E, Edinger H, Stanek C, Wurnig C
Journal: Equine veterinary journal
Summary
# Editorial Summary: Ultrasonographic investigation of the atlanto-occipital articulation in the horse The atlanto-occipital joint presents a diagnostic challenge due to its deep location and complex anatomy, yet injuries and degenerative changes in this region can significantly impact performance and rideability. Gollob and colleagues developed a systematic ultrasonographic protocol by examining 6 living horses and 16 cadaver specimens across four anatomically defined zones of the neck, scanning in both transverse and longitudinal planes to characterise the joint capsule, articular surfaces, and collateral ligaments. Ultrasonography successfully visualised the atlanto-occipital articulation and surrounding soft tissues, and the authors demonstrated a novel lateral approach for safe needle placement within the joint under ultrasound guidance. Whilst the findings confirm that ultrasound offers a non-invasive, accessible method for evaluating this region—particularly valuable for practitioners without access to advanced imaging—the reliance on cadaveric material and small sample size means further validation on live horses is essential before the technique can be reliably incorporated into clinical practice. For farriers and physiotherapists assessing neck dysfunction, these results suggest ultrasound may eventually offer a practical alternative to scintigraphy or MRI for investigating atlanto-occipital pathology, though current evidence does not yet support diagnostic confidence in this application.
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Practical Takeaways
- •Ultrasound offers a non-invasive, safe alternative to radiography for evaluating atlanto-occipital joint pathology and soft tissue structures in the cranial neck
- •A systematic scanning protocol dividing the neck into 4 zones with transverse and longitudinal views provides comprehensive visualization of this region
- •Further validation studies on live horses are needed before this technique can be routinely adopted in clinical practice
Key Findings
- •Ultrasonography successfully visualized joint surfaces, joint capsule, and collateral ligaments of the atlanto-occipital joint in both transverse and longitudinal planes
- •A new lateral ultrasonographic-guided approach to atlanto-occipital joint puncture was developed and performed on 4 horse specimens
- •Ultrasonography proved useful for soft tissue imaging of the cervical region without requiring invasive procedures