Cross-sectional area of the tendons of the tarsal region in Standardbred trotter horses.

Authors: Vilar J M, Santana A, Espinosa J, Spinella G

Journal: Equine veterinary journal

DOI: 10.1111/j.2042-3306.2010.00141.x PubMed: 21592221Log in to save

Summary

# Editorial Summary Understanding the normal dimensions of tarsal tendons is essential for identifying pathological changes via ultrasound, yet breed-specific reference values had not been established for Standardbred trotters. Vilar and colleagues obtained transverse ultrasound images of the tarsal tendons at multiple levels in a cohort of Standardbred trotters, digitised these images, and calculated cross-sectional area (CSA) measurements for each tendinous structure. The lateral digital flexor and caudal tibial tendon complex emerged as the largest structure at the proximal level, whilst the medial digital flexor tendon was the smallest at the distal level; notably, almost all tendons demonstrated a progressive reduction in CSA as they traversed the tarsus. These standardised measurements provide clinically valuable reference values against which suspected tendinous enlargement or atrophy can be objectively assessed in Standardbred trotter populations. Practitioners should note that breed-specific variation in normal tendon dimensions necessitates caution when applying these benchmarks to other equine breeds, reinforcing the need for comparable reference data in Quarter Horses, Thoroughbreds and other performance disciplines.

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Practical Takeaways

•Use these CSA reference values as baseline standards when performing ultrasound examinations of Standardbred trotter tarsal tendons to identify abnormal enlargement or atrophy
•Be aware that tarsal tendons normally decrease slightly in diameter distally—this is a normal finding and should not be misinterpreted as pathology
•Do not apply these reference values to other horse breeds; establish breed-specific norms for clinical comparison in different populations

Key Findings

•Normal cross-sectional area reference values established for tendons in the tarsal region of Standardbred trotter horses using ultrasonography
•Lateral digital flexor/caudal tibial tendon complex is the largest structure at proximal level; medial digital flexor tendon is smallest at distal level
•Nearly all tarsal tendons show a slight decrease in cross-sectional area as they traverse the tarsus
•Reference values are breed-specific and cannot be generalized across different horse breeds

Conditions Studied

tarsal tendon pathologytendon dimension changes

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