Core decompression of the equine navicular bone: an in vitro biomechanical study.
Authors: Jenner Florien, Kirker-Head Carl
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Core Decompression of the Equine Navicular Bone Florien and Kirker-Head investigated whether core decompression—a surgical technique proposed to relieve navicular pain by reducing intraosseous pressure—compromises the structural integrity of the navicular bone itself. Using 36 pairs of healthy navicular bones from young horses, the researchers measured bone mineral density via dual-energy X-ray absorptiometry, then drilled channels of varying diameters (2.5 or 3.2 mm) and numbers (one, two, or three holes) into one bone from each pair whilst leaving the contralateral bone intact as a control. Following mechanical testing to failure in three-point bending, they found significant positive correlations between BMD and breaking strength, confirming that denser bone behaves more mechanically resilient. The critical finding was a statistically significant reduction in breaking strength of approximately 13–20% in drilled compared to intact bones (P<0.001), regardless of hole diameter or quantity. Whilst this weakening effect was consistent across all decompression configurations, the specific drilling parameters—whether a single 3.2 mm channel or three 2.5 mm channels—produced broadly equivalent reductions in load-bearing capacity. For practitioners considering core decompression as a therapeutic option for navicular disease, these results suggest the procedure does structurally compromise bone strength in vitro, necessitating careful patient selection, realistic expectations regarding return-to-work timescales, and consideration of concurrent management strategies to minimise excessive loading during the healing phase.
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Practical Takeaways
- •Core decompression surgery structurally weakens the navicular bone in vitro, which may have implications for load-bearing capacity and post-operative rehabilitation protocols
- •Horse age and bone density status should be considered when evaluating candidates for core decompression, as stronger bones tolerate drilling better
- •Surgical technique variations (hole size/number) appear less critical than the decompression itself, suggesting standardized protocols are acceptable
Key Findings
- •Core decompression drilling significantly reduced breaking strength of navicular bones compared to intact controls (P<0.001)
- •Bone mineral density showed significant positive correlation with biomechanical strength properties (P<0.001)
- •Drill bit diameter (3.2 vs 2.5 mm) and number of channels (1, 2, or 3) did not significantly affect the degree of strength reduction (P>0.05)