Superficially visible proliferation of bone which occurs after physical overstimulation of the periosteum. This may be the result of trauma or of repeated strain.

A splint is the most frequantly encountered form of exostosis and occurs at the junction between the cannon bone (3rd metacarpal/metatarsal bone) and the splint bones (2nd and 4th metacarpal/metatarsal bones). Depending on their size and location, they may lead to lameness.