Suspensory Branch Desmitis in a Horse: Ultrasonography, Computed Tomography, Magnetic Resonance Imaging, and Gross Postmortem Findings.
Authors: Elemmawy Yahya M, Senna Nasser A, Abu-Seida Ashraf M, Youssef Ahmed F
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Advanced Imaging in Chronic Suspensory Ligament Branch Injury Suspensory ligament branch desmitis represents a significant cause of hindlimb lameness across equine disciplines, yet detailed imaging comparisons of chronic cases remain scarce in the literature. This case study documented ultrasonography, computed tomography (CT), and magnetic resonance imaging (MRI) findings in a 10-year-old draught horse presenting with severe, long-standing suspensory branch injury (8 months post-trauma), accompanied by grade 3/5 hindlimb lameness and substantial periligamentous swelling. Ultrasonography revealed enlarged, hyperechogenic ligament branches with poor margin definition and extensive periligamentous fibrosis, whilst CT imaging proved particularly valuable in demonstrating the three-dimensional extent of adhesions, fibrous proliferation, and air entrapment within the damaged tissues—findings that ultrasound alone could not fully characterise; MRI complemented this by identifying inflammatory fluid and fibrous adhesions without the osseous artefacts that sometimes complicate CT interpretation of distal limb structures. Postmortem examination confirmed the imaging findings, validating the diagnostic accuracy of both cross-sectional modalities. For practitioners managing chronic suspensory ligament injuries unresponsive to initial treatment, this case highlights that CT and MRI provide superior prognostic information regarding adhesion severity and tissue remodelling compared to ultrasound alone, potentially guiding treatment decisions and improving owner communication about long-term outcomes.
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Practical Takeaways
- •When dealing with chronic hindlimb suspensory ligament injuries, CT and MRI provide superior diagnostic detail compared to ultrasound alone, particularly for identifying extensive adhesions that may affect prognosis
- •Air entrapment within fibrous adhesions seen on CT imaging may indicate chronicity and tissue compromise relevant to treatment planning and athletic soundness prediction
- •Multimodal imaging (ultrasound, CT, and MRI) together offers the most complete assessment of chronic SL branch desmitis and should be considered for valuable horses with prolonged lameness
Key Findings
- •Ultrasonography revealed enlarged hyperechogenic SL branches with poor margin demarcation and periligamentous fibrosis in a 10-year-old draught horse with 8-month chronic desmitis
- •CT imaging demonstrated no osseous involvement but showed hypodense heterogeneous SL branches with periligamentous/peritendinous adhesions and air entrapment within fibrous tissue
- •MRI revealed high signal intensity from inflammatory fluid and intermediate signal intensity from periligamentous fibrous adhesions around SL branches
- •Both CT and MRI findings were confirmed by gross postmortem examination, establishing their value for diagnosing extensive adhesions in chronic SL branch desmitis