Application of sonoelastography for evaluating the stiffness of equine superficial digital flexor tendon during healing.
Authors: Tamura N, Kuroda T, Kotoyori Y, Fukuda K, Nukada T, Kato T, Kuwano A, Kasashima Y
Journal: The Veterinary record
Summary
# Sonoelastography: A More Sensitive Tool for Monitoring SDFT Healing When superficial digital flexor tendons (SDFTs) are injured, clinicians face a challenge: conventional greyscale ultrasound becomes less useful during late-stage rehabilitation because scarred tissue can appear structurally normal despite having compromised mechanical properties. Tamura and colleagues investigated whether sonoelastography—a technique that measures tissue stiffness rather than structure—could track healing progression more effectively across injury timescales. Over 18 horses classified by injury duration (within 2 weeks, ~5 months, and ~9 months), the team performed both conventional ultrasound and sonoelastography on affected tendons, with two independent observers grading the images using standardised scoring systems. Crucially, sonoelastography demonstrated significant differences in tissue stiffness between all three timepoints and showed almost perfect observer agreement, whereas conventional ultrasound failed to distinguish between the 5- and 9-month groups. This distinction matters clinically: sonoelastography offers a more nuanced window into the biomechanical recovery of healing SDFTs, potentially enabling more informed decisions about return-to-work timelines and identifying animals at ongoing risk of re-injury when structural appearance suggests readiness that the tissue stiffness does not support.
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Practical Takeaways
- •Sonoelastography can detect changes in tendon stiffness that standard ultrasound cannot distinguish during late-stage healing (5+ months post-injury), helping inform rehabilitation progression
- •This imaging modality provides objective, reproducible assessment of lesion quality that may improve decision-making about return-to-work timelines
- •Consider sonoelastography as a supplementary diagnostic tool when standard ultrasound findings plateau but clinical recovery is still ongoing
Key Findings
- •Sonoelastography demonstrated almost perfect interobserver agreement for evaluating injured SDFTs
- •Significant differences in sonoelastographic grades were found among three time-points: within 2 weeks, 5 months, and 9 months post-injury
- •Grey-scale ultrasonography showed no significant difference between 5-month and 9-month groups, whereas sonoelastography distinguished between them
- •Sonoelastography is useful for assessing tissue stiffness and healing progression even during the chronic phase of SDFT injury