In medicine a Busch fracture is a type of fracture of the base of the distal phalanx of the fingers, produced by the removal of the bone insertion of the extensor tendon. Without the apropiate treatment, the finger becomes a hammer finger. It would correspond to the group B of the Albertoni classification. It is very common in motorcycle riders and soccer joggers, caused by a hyperflection when the tendon is exercising the maximum tension.
The Busch fracture is named after Friedrich Busch 1844-1916, who described this type of fracture in the 1860s. Buschs work was drawn on by Albert Hoffa in 1904, resulting in it sometimes being called a "Busch-Hoffa fracture".
The mechanism of this injury can be described as an avulsion of the tendon fixed to the distal falange.