Standing magnetic resonance imaging detection of bone marrow oedema-type signal pattern associated with subcarpal pain in 8 racehorses: a prospective study.
Authors: Powell S E, Ramzan P H L, Head M J, Shepherd M C, Baldwin G I, Steven W N
Journal: Equine veterinary journal
Summary
# Editorial Summary: Standing MRI Detection of Bone Marrow Oedema in Subcarpal Lameness Lameness originating from the proximal metacarpal region remains diagnostically challenging in racehorses despite conventional imaging techniques, prompting investigation into whether standing MRI could reveal pathology missed by radiography and ultrasound. This prospective study examined eight racehorses with subcarpal pain using high-field standing MRI, identifying bone marrow oedema-type signal patterns in the metacarpal bones and carpal region that correlated with clinical lameness localisation. The consistent detection of marrow oedema in horses with subcarpal pain suggests this finding may represent a distinct pathological entity separate from recognised conditions such as metacarpal stress fractures or carpal chip fractures, potentially explaining cases where traditional imaging appears unremarkable. For practitioners managing performance horses with persistent subcarpal lameness undiagnosed by conventional means, standing MRI offers superior soft tissue and bone marrow visualisation that could refine diagnosis and inform targeted rehabilitation or treatment strategies. The ability to image weight-bearing limbs without general anaesthesia makes this approach particularly valuable for racehorses where prolonged recovery is economically and athletically costly, though further investigation in larger populations is warranted to establish whether bone marrow oedema-type patterns represent a primary pathology, secondary change, or innocent finding in the proximal metacarpal region.
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Practical Takeaways
- •MRI offers diagnostic advantages over traditional imaging for investigating proximal metacarpal pain when clinical lameness diagnosis is unclear
- •Bone marrow oedema should be considered as a differential diagnosis in racehorses presenting with subcarpal pain
- •Standing MRI technology provides a practical diagnostic tool for investigating common sites of lameness in performance horses
Key Findings
- •MRI detected bone marrow oedema-type signal patterns in 8 racehorses presenting with subcarpal pain
- •Standing MRI was successfully used to investigate proximal metacarpal region pathology in performance horses
- •Bone marrow oedema was identified as a potential disease entity in proximal metacarpal lameness cases