Comminuted fracture: Once the kneecap breaks into multiple displaced parts, surgeons take out fragments far too small to fix and reconnect remaining parts with wires and screws. Significant circumstances could need comprehensive patella elimination. Grade IV: The Canine will walk with rear inside a crouched position, the patella is permanently displaced https://www.theorthopaedicandpainpractice.com/what-are-patella-fractures/