CONGENITAL DISLOCATION OF THE DEEP DIGITAL FLEXOR TENDON ASSOCIATED WITH HYPOPLASIA OF THE SUSTENTACULUM-TALI IN A THOROUGHBRED COLT

An 11-month-old Thoroughbred colt was presented with a hard swelling a t the proximal third of the right 4th metatarsal bone. A medial disloc ation of the deep digital flexor tendon (flexor digitorum profuradus) was also observed on the same leg. On the plantaroproximal-plantarodis tal projection of the calcaneus, there was flattening and shortening o f the sustentaculum tall. The smooth bony proliferation at the proxima l third of the right 4th metatarus was compatible with a chronic splin t bone fracture. This report describes a medial deep digital flexor as sociated with hypoplasia of the susten-taculum tali.