Degenerative Joint Disease of the Interphalangeal Joints (Ringbone)
Is it Significant?
Figure 40 depicts degenerative joint changes of the distal interphalangeal articulation,
a separate ossification center or old fracture of the extensor process of the third phalanx, and a
suspected bone spur involving the navicular bone. The combination of the separate ossification
center and degenerative joint changes (ringbone) are significant, and I would have a very
pessimistic outlook on the future soundness of this horse. In reviewing proliferative changes of
the cranial aspects of the second phalanx, the age of the animal and the amount of work that he
has done are important considerations. As the animal ages and does more work, rather advanced
periosteal proliferative changes would have to be seen on the second phalanx to be considered
significant and detrimental to future soundness.
Lateral radiograph of the foot demonstrating a separate ossification center or old chip fracture of
the extensor process of P3 with degenerative changes (periosteal proliferation) along the cranial
aspects of the second phalanx, consistent with a radiographic diagnosis of ringbone. There also
appears to be a bone spur along the wing of the navicular bone.
If you think you can combine what you have learned from several of the past sections, see .