In medicine a Busch fracture[1] is a type of fracture of the base of the distal phalanx of the fingers, produced by the removal of the bone insertion (avulsion) of the extensor tendon.

It would correspond to the group B of the Albertoni classification.

[2] It is very common in motorcycle riders and soccer joggers, caused by hyperflexion when the tendon is exercising its maximum tension (the closed hand tightening the clutch lever or the brake lever).

Busch's work was drawn on by Albert Hoffa in 1904, resulting in it sometimes being called a "Busch-Hoffa fracture".

[5] The mechanism of this injury can be described as an avulsion of the tendon fixed to the distal phalanx.