Accuracy of ultrasound-guided intra-articular injection of cervical facet joints in horses: a cadaveric study.
Authors: Nielsen J V, Berg L C, Thoefnert M B, Thomsen P D
Journal: Equine veterinary journal
Summary
Ultrasound-guided intra-articular injection of cervical facet joints is an established diagnostic tool in human medicine, yet its reliability in equine patients remained unvalidated until this cadaveric investigation. Nielsen and colleagues performed 60 blue-dye injections targeting the facet joints from C2 to C7 on equine cadavers, then dissected the joints to verify needle placement accuracy. Overall, 72% of injections achieved true intra-articular positioning, with a further 17% reaching the joint capsule, and impressively, 98% deposited material within 1 mm of the target structure—demonstrating sufficient anatomical precision for both diagnostic and therapeutic applications. Operator experience proved the critical variable affecting success rates (P < 0.01), whereas other tested factors showed no significant influence. Whilst cadaveric models cannot fully replicate the challenges of live-horse anatomy and movement, these findings support the clinical viability of ultrasound-guided cervical facet joint injections from C2 to C7, provided practitioners undertake structured training on cadaver specimens before applying the technique to clinical cases.
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Practical Takeaways
- •Ultrasound-guided cervical facet joint injection is a viable diagnostic and therapeutic technique in horses, with high success rates when performed by experienced operators
- •Practitioners should gain proficiency using cadaver specimens before applying this technique to live horses, as experience significantly improves accuracy
- •The technique offers potential benefits for investigating and treating cervical facet-related lameness and pain in equine patients
Key Findings
- •72% of ultrasound-guided injections were successfully placed intra-articularly in cadaveric cervical facet joints (C2-C7)
- •98% of injections were deposited within 1mm of the joint capsule, indicating high anatomical precision
- •Operator experience significantly improved accuracy (P<0.01), with marked effect of gained practice
- •Method is technically feasible for both diagnostic and therapeutic use in cervical facet joints C2-C7