Magnetic resonance and radiographic diagnosis of osseous resorption of the flexor surface of the distal phalanx in the horse
Article first published online: 27 NOV 2012
© 2012 EVJ Ltd
Equine Veterinary Journal
Special Issue: 58th Annual Convention of the American Association of Equine Practitioners. Guest Editors: N. White, D. Sellon and B. Ball. Publication of this supplement was supported by the American Association of Equine Practitioners
Volume 44, Issue Supplement S43, pages 3–7, December 2012
How to Cite
Young, A. C., Dimock, A. N., Puchalski, S. M., Murphy, B. and Spriet, M. (2012), Magnetic resonance and radiographic diagnosis of osseous resorption of the flexor surface of the distal phalanx in the horse. Equine Veterinary Journal, 44: 3–7. doi: 10.1111/j.2042-3306.2012.00675.x
- Issue published online: 27 NOV 2012
- Article first published online: 27 NOV 2012
- Manuscript Accepted: 31 AUG 2012
- Manuscript Received: 29 FEB 2012
- magnetic resonance imaging;
- osseous resorption;
- distal phalanx
Reasons for performing study
Osseous resorption of the flexor surface of the distal phalanx of the horse has been identified previously using magnetic resonance (MR) imaging; however, little is known about the prevalence and characteristics of this lesion.
To establish the MR prevalence of resorptive lesions in the flexor surface of the distal phalanx and identify concurrent lesions associated with this finding and associations between the MR and radiographic findings.
Horses with distal extremity MR and radiographs performed within 2 weeks of each other were included in the study. The flexor surface of the distal phalanx was graded independently on both modalities for the presence of osseous resorption. The sensitivity and specificity of radiography for identifying osseous resorption was calculated using MR as the gold standard.
Eighty-two MR studies met the inclusion criteria, 8 of which included osseous resorption of the flexor surface of the distal phalanx. Concurrent injury to the deep digital flexor tendon and the navicular bone was a common finding. An association between MR and radiographic grades was identified. Radiography had a high specificity (0.96) but lower sensitivity (0.45–0.55) for detecting osseous resorption.
Osseous resorption of the flexor surface of the distal phalanx can be observed both on MR and radiographic examinations of horses with lameness localised to the foot. This lesion is most often associated with other pathological changes in the podotrochlear apparatus.
Focal radiolucency of the flexor surface of the distal phalanx is a newly recognised radiographic sign associated with pathological changes of the podotrochlear apparatus.