Response to Letter to the Editor: Validation of standing cone beam computed tomography for diagnosing subchondral fetlock pathology in the Thoroughbred racehorse

Wulster, Kathryn B.; Ortved, Kyla F.; Curtiss, Alexandra L.; Richardson, Dean W.

doi:10.1111/evj.13441

Cited by 1 publication

(2 citation statements)

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“…Previous research suggests that a substantial number of lateral condylar fractures originate in the mid palmar/plantar condyle, abaxial to the parasagittal groove; however, these studies do not document concurrent POD lesions in the affected condyles [ 29 , 36 ]. There is unpublished research from the University of Pennsylvania suggesting this appearance is consistent with an incomplete condylar fracture configuration detectable on standing CT [ 37 ]; however, we hypothesize that these linear lucencies could also represent enlarged vascular channels associated with POD pathology.…”

Section: Discussionsupporting

confidence: 61%

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Imaging and Gross Pathological Appearance of Changes in the Parasagittal Grooves of Thoroughbred Racehorses

Johnston

Ahern

Palmieri

et al. 2021

Animals

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(1) Background: Parasagittal groove (PSG) changes are often present on advanced imaging of racing Thoroughbred fetlocks and have been suggested to indicate increased fracture risk. Currently, there is limited evidence differentiating the imaging appearance of prodromal changes in horses at risk of fracture from horses with normal adaptive modelling in response to galloping. This study aims to investigate imaging and gross PSG findings in racing Thoroughbreds and the comparative utility of different imaging modalities to detect PSG changes. (2) Methods: Cadaver limbs were collected from twenty deceased racing/training Thoroughbreds. All fetlocks of each horse were examined with radiography, low-field magnetic resonance imaging (MRI), computed tomography (CT), contrast arthrography and gross pathology. (3) Results: Horses with fetlock fracture were more likely to have lateromedial PSG sclerosis asymmetry and/or lateral PSG lysis. PSG lysis was not readily detected using MRI. PSG subchondral bone defects were difficult to differentiate from cartilage defects on MRI and were not associated with fractures. The clinical relevance of PSG STIR hyperintensity remains unclear. Overall, radiography was poor for detecting PSG changes. (4) Conclusions: Some PSG changes in Thoroughbred racehorses are common; however, certain findings are more prevalent in horses with fractures, possibly indicating microdamage accumulation. Bilateral advanced imaging is recommended in racehorses with suspected fetlock pathology.

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Section: Discussionsupporting

confidence: 61%

“…Multiple flexed DP angles should be acquired in order to maximize the detection of lesions in different areas of the palmar/plantar aspect of the condyles. However, this does not replace the need for advanced cross-sectional imaging in many cases of suspected fetlock pathology [ 37 , 43 , 44 ].…”

Section: Discussionmentioning

confidence: 99%