Fixation with pins, screws, plates, or wires is placed directly on or in the bone to immobilize a fractured bone and to maintain alignment while it heals.

The answer is: Internal fixation

Explanation:

Internal fixation is a surgical procedure which involves implanting an internal fixator or an implant for repairing a bone and preventing infection, in case of a fracture. These implants or internal fixators include kirschner wires, plates, screws and intramedullary nails, which are made of the alloys of titanium and cobalt-chrome and stainless steel.  

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