Comparison of four techniques of arthrocentesis of the lateral compartment of the femorotibial joint of the horse.
Authors: Schumacher John, Schumacher Jim, Wilhite R
Journal: Equine veterinary journal
Summary
# Editorial Summary: Arthrocentesis of the Lateral Femorotibial Compartment Clinical practitioners have long experienced difficulties reliably accessing the lateral compartment of the equine stifle joint, prompting Schumacher and colleagues to systematically evaluate four arthrocentesis techniques using radiographic verification of needle placement. In a controlled study using 24 stifles from 12 horses, twelve inexperienced veterinary students performed needle injections of radiocontrast medium via four different approaches: caudal to the lateral patellar ligament, caudal to the long digital extensor (LDE) tendon, between the LDE tendon and bone, and directly through the LDE tendon itself. The technique involving direct needle passage through the LDE tendon achieved 100% accuracy in reaching the lateral compartment, whilst the other three approaches demonstrated notably lower success rates when performed by clinicians unfamiliar with the procedure. For practitioners seeking reliable access to this compartment—particularly when performing intra-articular injections or synovial fluid collection—directing the needle through the LDE tendon as it sits in the extensor groove of the tibia represents the most consistently successful approach regardless of operator experience level. This finding has significant implications for standardising stifle arthrocentesis protocols in equine practice, as it identifies a reproducible anatomical landmark that substantially improves first-attempt accuracy.
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Practical Takeaways
- •For reliable access to the lateral femorotibial joint compartment, insert the needle directly through the long digital extensor tendon in the extensor groove rather than attempting alternative approaches
- •This technique's 100% success rate in inexperienced hands makes it the preferred method for routine joint injections and diagnostic arthrocentesis
- •If you struggle with lateral femorotibial joint access using traditional landmarks, switching to the long digital extensor tendon approach will improve your success rate substantially
Key Findings
- •Needle insertion through the long digital extensor tendon achieved 100% success rate for lateral femorotibial joint arthrocentesis
- •Alternative techniques (caudal to lateral patellar ligament, caudal to long digital extensor tendon, and between tendon and bone) had lower success rates
- •Technique was performed successfully by inexperienced veterinary students, indicating it is reliable for clinicians without specialized training