 The uncemented fixation of the H1 hip resurfacing is not novel. The porous ingrowth coating of plasma sprayed titanium and hydroxyapatite has been applied by a leading implant coating specialist Medicoat AG, Mägenwil, Switzerland. Acetabular cups using these coatings are now standard products with more than 15 years of experience. Several metal-on-metal hip resurfacing designs for non-cemented use, have successfully been implanted in large series of patients. Ti ions may be released as part of the bone ingrowth process of the non-cemented hip of knee prosthesis, but Ti_ions from Titaniumdioxyde TiO2 coatings or Titanium-aluminum-vanadium TiAlV hip or knee arthroplasty components are not associated with toxic, teratogenic or carcinogenic reactions. 