Figure 3

Re-radiographed hooves. All radiographs have lateral to the right. A. Radiographs of the left front hoof of a 2.5 year old cold-blooded mare with a highly ossified cartilage and separate centers of ossification in both lateral and medial sides. The grading’s were 4 and 5 with Ruohoniemi scale, plus 2 and 3 with the new scale. B. Same hoof eight years and 68 races later. Here ossification is more complete but the separate centers of ossification have not fused with the OUC originating from the base of the cartilage and there is no different OUC grading. C. Radiographs of left front hoof of a 6 year old unraced mare with OUC of grade 2 and 5, Ruohoniemi scale, and grade 0 and 3, new scale, medial and lateral respectively. D. Same hoof thirteen years and 58 races later, still with OUC of grade 2 and 5 using the Ruohoniemi scale but now with grade 1 and 3 according to the new scale.