Magnetic biomaterials are powerful multifunctional tools in theranostic. They can be remotely controlled by an external magnetic field. When a radiofrequency field is used, the magnetic nano- or microparticles embedded in the biomaterial dissipate heat, which can be used for therapeutic purposes. Hyperthermia treatment of deep- seated tumors, such as bone cancers, can extensively benefit from the use of such class of magnetic responsive biomaterials. Therefore, in this work it is presented the numerical analysis of the hyperthermia treatment of secondary bone tumors performed using a magnetic hydroxyapatite prosthesis.