Computer-assisted surgery for screw insertion into the distal sesamoid bone in horses: an in vitro study.
Authors: Gygax Diego, Lischer Christoph, Auer Joerg A
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Computer-Assisted Surgery for Distal Sesamoid Screw Fixation Fractures of the equine distal sesamoid bone (navicular bone) present a significant surgical challenge, particularly when precise screw placement is critical to load-sharing and healing outcomes. Researchers compared conventional fluoroscopy-guided insertion against computer-assisted navigation for placing 3.5 mm cortex screws in lag fashion through eight cadaveric forelimbs in each group, with accuracy verified through radiography, CT imaging, and gross specimen dissection. Computer-assisted surgery demonstrated superior precision in lateromedial screw trajectory along the longitudinal axis of intact distal sesamoid bones compared to the conventional guiding device technique. For practitioners managing distal sesamoid fractures—particularly comminuted or complex cases where screw mislacement could compromise weight-bearing surfaces or cause soft tissue complications—this work suggests that navigation-guided techniques warrant consideration if available, as improved positional accuracy may translate to better functional outcomes and reduced revision rates. However, given this was an in vitro cadaveric study, clinical validation in live surgical cases and assessment of cost-benefit relative to standard approaches would strengthen the practical case for adoption in equine orthopaedic practice.
Read the full abstract on PubMed
Practical Takeaways
- •Computer-assisted navigation may offer a more precise alternative to fluoroscopy-guided screw placement for distal sesamoid bone fracture repair, potentially reducing malpositioning complications
- •For practices performing high numbers of sesamoid fracture repairs, CAS technology could improve clinical outcomes, though availability and training requirements must be considered
- •This in vitro study supports investigation of CAS in clinical cases but results are preliminary and require in vivo validation before widespread adoption
Key Findings
- •Computer-assisted surgery (CAS) demonstrated superior surgical precision compared to conventional technique (CV) with fluoroscopic guidance for screw insertion into distal sesamoid bones
- •CAS improved accuracy of lateromedial screw insertion in lag fashion into the distal sesamoid bone in cadaveric specimens
- •Accuracy was verified through multiple imaging modalities (radiography, CT) and direct specimen dissection