Miscellaneous Conditions of the Proximal Interphalangeal Joint and Fetlock



Chip Fracture on the Second Phalanx

In Figures 41 and 42, there is evidence of a well rounded calcified area (chip fracture) involving the proximal aspect of the second phalanx. I have seen this kind of change in a number of horses as a coincidental finding, unrelated to a lameness problem. It is probably a separate ossification center or a piece of cartilage that has separated from the parent portion of bone and has ossified. It is frequently seen bilaterally.
Figure 41. Figure 42.
Anteroposterior radiograph of the proximal interphalangeal articulation demonstrating a separate ossification center or old fracture of the proximal aspect of the second phalanx or the caudal distal aspect of P1. Oblique radiograph of the proximal interphalangeal joint of the same horse radiographed in Figure 41 demonstrating the same old fracture or separate ossification center along the proximal aspect of the second phalanx or the caudal distal aspect of P1.