Subclinical Ultrasonographic Abnormalities of the Suspensory Ligament Branches Are Common in Elite Showjumping Warmblood Horses.
Authors: Read Rachel Mercedes, Boys-Smith Sarah, Bathe Andrew Perry
Journal: Frontiers in veterinary science
Summary
# Editorial Summary Read, Boys-Smith and Bathe's 2020 cross-sectional ultrasonographic study examined 60 elite showjumping Warmbloods without clinical suspensory ligament branch (SLB) disease to establish the prevalence of subclinical abnormalities that might otherwise go undetected. Using standardised grading (0–3 scale) and blinded assessment by two experienced clinicians, they found that moderate (grade 2) ultrasonographic changes affected 58% of all SLBs examined, with notably higher periligamentous fibrosis in hindlimbs (64%), yet no significant difference between forelimbs and hindlimbs or medial and lateral branches overall. Despite these widespread imaging findings, only two horses were withdrawn from competition over the 12-month follow-up period, suggesting that moderate subclinical abnormalities rarely progress to clinically significant injury in actively competing animals. For practitioners involved in prepurchase examinations, performance assessment and clinical decision-making, this research provides important context: ultrasonographic SLB changes should be interpreted cautiously rather than assumed to indicate either poor prognosis or inevitable lameness, and moderate abnormalities may reflect normal adaptive remodelling in horses subjected to the high demands of elite jumping. The authors appropriately acknowledge limitations including small sample size and static imaging without hair clipping, meaning findings are most applicable to similar populations rather than generalised across all sports horses.
Read the full abstract on PubMed
Practical Takeaways
- •Moderate ultrasonographic SLB abnormalities are normal findings in competing elite showjumpers and should not automatically raise concern at prepurchase examination or drive treatment decisions
- •Clinical lameness and poor performance are uncommon consequences of subclinical SLB changes, so interpret ultrasound findings conservatively rather than treating all structural changes as pathological
- •Hindlimbs showing periligamentous fibrosis warrant closer monitoring, though the low injury incidence suggests most horses tolerate these changes without detriment
Key Findings
- •58% of suspensory ligament branches in elite showjumpers exhibited grade 2 (moderate) ultrasonographic abnormalities despite absence of clinical signs
- •Periligamentous fibrosis was significantly overrepresented in hindlimbs (64%) compared to forelimbs
- •Only 2 of 60 horses (3%) were excluded from competition due to SLB injury over 12-month follow-up, indicating subclinical findings have low clinical significance
- •Interobserver agreement for grading was good (kappa = 0.65), with no statistical difference in abnormality prevalence between forelimbs/hindlimbs or medial/lateral branches