Osteochondral fragments in the metacarpo- and metatarsophalangeal joint and their clinical importance

摘要

The radiographic evaluation of the fetlock joint as part of a lameness or prepurchase examination often reveals osteochondral fragmentation. These fragments can either be causing lameness or have no clinical importance at the time of examination. However, they can cause lameness at a later stage. An appropriate analysis of the situation requires a correct assessment of the fragment type and an up-to-date knowledge of their possible clinical importance. In this overview, the most common types of fetlock fragments, such as dorsoproximal first phalanx (PI) and proximal synovial pad fragments, as well as fragmentation on the proximal palmar/plantar border of PI and of the sesamoid bones are discussed. A few cases of uncommon large fragmentation on the abaxial borders of P1 are included. Fetlock fractures, obviously causing lameness, such as dorsofrontal fractures of the proximal phalanx, distal metacarpal/metatarsal and sesamoid bone fractures, are not dealt with in this review.