Figure 21: Dorsoventral radiograph of the foot demonstrating lollipops along the distal border of the navicular bone with cones and lollipops involving the wings of the navicular bone.

Figure 22: Dorsoventral radiograph of the foot demonstrating lollipops along the distal border of the navicular bone.

Figure 23: Dorsoventral radiograph of the foot demonstrating lollipops along the distal border of the navicular bone.

Figure 24: Dorsoventral radiograph of the foot demonstrating cones and lollipops along the distal border and wings of the navicular bone.

Figure 25: Dorsoventral radiograph of the foot demonstrating lollipops along the distal border of the navicular bone.

Figure 26: Dorsoventral radiograph of the foot demonstrating a very large cyst-like lesion in the center of the navicular bone.

Figure 27: Anteroposterior radiograph of the foot demonstrating a cyst-like lesion in the central portion of the navicular bone.

Figure 28: Dorsoventral radiograph of the foot demonstrating spur formation on the wing of the navicular bone, resulting in the appearance of the bow of a canoe.

Figure 29: Anteroposterior radiograph of the foot demonstrating an early bone spur along the wing of the navicular bone.

Figure 30: Dorsoventral radiograph of the foot demonstrating a bone spur along the wing of the navicular bone.

Figure 31: Lateral radiograph of the foot demonstrating a bone spur involving the wing of the navicular bone.

Figure 32: Anteroposterior radiograph of the foot demonstrating a bone spur along the wing of the navicular bone.

Figure 33: Anteroposterior radiograph of the foot demonstrating significant ossification of the collateral cartilage with a bone spur along the wing of the navicular bone. There are degenerative changes present involving the proximal interphalangeal articulation.

Figure 34: Anteroposterior radiograph of the foot demonstrating an old fracture or separate ossification center of the navicular bone with bone spur formation involving the wings of the navicular bone.

Figure 35: 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.

Figure 36: 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.

Figure 37: 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.

Figure 38: Lateral radiograph of the fetlock demonstrating an old chip fracture along the cranial and proximal aspect of the first phalanx. There are also degenerative changes consisting of osteolytic and periosteal proliferative changes along the cranial and distal aspect of the third metacarpal bone.

Figure 39: Lateral radiograph of the fetlock demonstrating a separate ossification center or old chip fracture along the caudal and proximal aspect of the first phalanx. In this radiograph there does not appear to be evidence of bony activity at this time. There also appears to be a small fragment proximal to the large fragment of bone.

Figure 40: Oblique radiograph of the fetlock of the same horse radiographed in case 44 demonstrating the separate ossification center or old fracture of the proximal aspect of the first phalanx.