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Indications for prosthetic reimplantation.

It is difficult to establish on the basis of rigorous criteria when a prosthetic implant must be considered loosened, but it is even more difficult to define with certainty whether a loosened prosthesis must be reimplanted, and particularly when it is necessary to act. The authors emphasize the need to act quickly every time there is loss of periprosthetic bone substance that progresses in time, and that may make anatomical reconstruction difficult.