Fig. 7. T1WGE frontal. The arrows indicate an incomplete, mid- line sagittal fracture in the proximal phalanx.
Fig. 9. Dorsal plantar digital radiograph of the right hind foot proximal phalanx. The arrow indicates an incomplete, midline sagittal fracture in the proximal phalanx.
ough soundness examination, which included pe- ripheral nerve diagnostic anesthesia, was completed by the referring veterinarian. This horse was noted to be sound when trotted in hand but 1/5 lame on the left front under tack when trotted to the left. There was also some lameness noted in the right front when trotted under tack to the right, but this lameness improved readily. Anesthesia of the lat- eral and medial palmar digital nerves of the left front partially improved the lameness to the left and exacerbated the right front lameness on a circle to the right. A mid-pastern ring block of the left front abolished the left front lameness. No further block- ing was done of the right front limb to further char- acterize that lameness.
Radiographs of the right front foot and pastern
were unremarkable, and radiographs of the left front foot and pastern indicated mild remodeling of the dorsolateral aspect of the left front middle pha- lanx at the joint capsule insertion. Radiographs of the left metacarpophalangeal joint were unremark- able; those of the right indicated a small osteochon- dral fragment associated with the dorsomedial aspect of the proximal phalanx. An ultrasound evaluation of the left front pastern indicated a subtle enlargement of the proximal and lateral aspects of the left front straight distal sesamoidean ligament with subtle fiber disruption proximally (Fig. 10).7 An MRI evaluation was requested to confirm desmi- tis of the left front straight distal sesamoidean lig-
Fig. 8. T1W GE transverse. The arrow indicates an incom- plete, midline sagittal fracture in the proximal phalanx.
Fig. 10. Transverse ultrasound image of the left hind foot prox- imal palmar pastern. The arrow indicates subtle fiber disrup- tion in the proximal aspect of the straight distal sesamoidean ligament.
