**7. Conclusion**

Modern coatings are safe and provide in numerous pre-clinical studies advantages compared to standard implants regarding wear and metal ion release. They are, however, more expensive in many countries and can therefore often not be used routinely. Therefore, advantages and disadvantages need to be balanced to choose the patients who will benefit most. There is no general concern about metal ion release from CoCrMo standard implants for most patients. If patients present with a confirmed metal allergy, a multilayer-coated or oxidized zirconium implant is currently the best option for these patients.
