Endoprothesis made of a magnesium alloy

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Endoprosthesis (A) includes a load-bearing structure that consists, entirely or in part, of a magnesium alloy (I) of composition (by weight) 60-88% magnesium; 2-30% rare earth metals (REM); 2-20% yttrium; 0.5-1.5% zirconium; 0-10% other materials.