Various modular implants and modular implant systems are disclosed herein, as are methods of embedding them. The modular implant system can include modular implants that are stacked on top of one another to form a modular implant system that can be used to replace or augment bone voids in one embodiment. The modular implant can interact with the intramedullary implant, for example, to assist in fusion. [Selection diagram] Fig. 1