a method for preparing a material for medical or veterinary use by uniformly mixing a thermoplastic polymer , preferably polyether etherketone , at least with tricalcium phosphate 2 ), and injection or extrusion moulding the resulting mixture under conditions suitable for converting the tricalcium phosphate into calcium hydroxyapatite . tite . the basic mixture preferably comprises a biocompatible metal oxide such as titanium dioxide . the resulting material is useful for making endosseous implants or bone prostheses .