Osteochondral fragments of the pastern joint at the origin of the collateral ligament of the distal sesamoid bone: performance after arthroscopic removal (2000-2015).

Objective: To describe the presence of fragments in the dorsal proximal interphalangeal (PIP) joint and to report flat racing performance after surgical treatment.

Study Design: Retrospective study.

Sample Population: Thirty-nine affected thoroughbred flat racehorses and 169 age- and sex-matched maternal siblings.