In which type of fracture do the fragments of bone break completely but do not shift?

A fracture in which the fragments of bone break completely but do not shift is known as a nondisplaced fracture. This type of fracture means that although the bone has broken, the ends of the fractured bone pieces remain aligned in their normal anatomical position. Nondisplaced fractures generally have less risk of complications related to displacement, such as damage to surrounding tissues or misalignment during healing.

The other types of fractures listed involve different characteristics. Pott's fracture specifically refers to an ankle fracture involving the fibula and often occurs with an injury to the tibia as well, which is not characterized by the alignment of the bone fragments. Comminuted fractures involve the bone breaking into several pieces, indicating a more complex situation than a simple fracture, while Colles' fracture typically refers to a specific type of distal radius fracture in the forearm that often results from a fall on an outstretched hand. Therefore, none of these options describe the condition of the fragments remaining aligned as clearly as nondisplaced fractures do.