Summary
Implant associated fractures have not been reported in horses. Two horses were evaluated
for fractures in the fore limbs, occurring subsequent to previous fracture repair.
Previously, the horses had sustained fractures of unusual configurations which were
repaired using internal fixation. Following repair and healing of the fractures, secondary
fractures occurred in the same bone, but in a different (more common) configuration.
The first horse was evaluated ten months following lag screw fixation of a longitudinal
fracture of the proximal phalanx in a frontal plane. This horse presented with a more
typical comminuted fracture in the sagittal plane with the screws from the first fixation
lying in the fracture line. This fracture was successfully treated with a cast. The
second horse was examined eightteen months after repair of a medial sagittal slab
fracture of the third carpal bone. The horse presented with a more typical dorsal
slab fracture of the third carpal bone with the previously placed lag screw lying
in the fracture line. The screw was removed and a lag screw was placed perpendicular
to the new fracture plane through the dorsal surface of the third carpal bone to repair
the fracture.
Key words
Secondary fracture - Internal fixation - Horse
