Radiographic characterization of ossification of the ungular cartilages in horses: 271 cases (2005-2012).

The research investigates and describes the radiographic characteristics of ossification (hardening) of hoof cartilage in horses from 271 different cases over a seven-year period. It particularly highlights the value of a particular radiographic view in evaluating these cartilages.

Introductory Background and Methodology

• The purpose of this retrospective case series was to understand the physical appearance of ossified cartilage within a horse’s foot using radiographs, and the relevance of a specific radiographic view, the flexed dorsolateral-palmaromedial oblique (flexed oblique).
• The study assessed 1,255 front feet radiographs from horses, rating the degree of cartilage ossification on a scale from 0 to 5. Feet with cartilages undergoing substantial ossification (receiving a grade of 2 or above) were exclusively considered in this study, resulting in the inclusion of 386 feet derived from 271 horses.
• Diverse factors such as the ossification shape, abnormalities, bone structure, ossification grade, the foot’s side, and the cartilage location (lateral or medial) were examined and recorded. The research team also assessed any abnormal shape and fractures, with the aid of the flexed oblique view.

Results and Findings

• Fractures were mostly found in hooves with an ossification grade of 4 or 5. The same fractures were best identified via the flexed oblique view—these results emphasize the view’s relevance over traditionally recommended radiographic views.
• Statistical analysis displayed a notable positive correlation between higher ossification grades and changes of modeling or adaptation; the more ossified a cartilage was, the likelier it was to display these changes.
• Cartilages with abnormal shapes were also more likely to feature modeling or adaptive changes, in contrast to ordinarily shaped cartilages.

Conclusion and Recommendations

• The authors concluded that a horse foot cartilage’s advanced ossification poses substantial risk factors for modeling and adaptive changes—more so if the ossified cartilage had abnormal shapes, like outwards or inwards curvatures, palmar curvature or a bulbous form.
• The flexed oblique view was demonstrated to provide crucial clinical information, significantly aiding the detection of abnormal shapes and fractures. Thus, it was recommended that it should be routinely implemented for comprehensive radiographic examinations of ossified ungular cartilages in a horse’s foot.