The directional-ionizing energy emitting implant is for attachment either to natural tissue or a prosthetic device, and delivers a prescribed dosage of energy to targeted tissue. The insert device includes an energy-source material within the insert device that delivers the prescribed dosage of energy to the targeted tissue, while minimizing exposure of nontargeted tissue. The targeted tissue has a known energy-response profile and is adjacent to the targeted tissue. The energy-source material in combination with the prosthetic device defines an actual energy-delivery distribution field. The energy-delivery distribution field has a configuration similar to the known energy-responsive profile of the targeted tissue. The prescribed dosage of energy is applied from energy-source material within the insert device and directed to the targeted tissue. The prescribed energy dosage is determined by using known characteristics of the energy-source material, and by the placement of the energy-source material relative to the targeted tissue. The implant system reduces any occurrence of heterotopic ossification caused by the implant, inhibits growth or migration of benign or malignant living cells, and minimizes or even eliminates infectious processes or delayed keloid or scar formation induced from surgical placement of a functional prosthesis or fixation device, in tissue within or about the device due to its targeted therapeutic energy emission effects.