Designation:F1612–95(Reapproved2000)StandardPracticeforCyclicFatigueTestingofMetallicStemmedHipArthroplastyFemoralComponentswithTorsion1ThisstandardisissuedunderthefixeddesignationF1612;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversamethodforthefatiguetestingofmetallicstemmedfemoralcomponentsusedinhiparthroplasty.Thedescribedmethodisintendedtobeusedforevaluationincomparisonsofvariousdesignsandmaterialsusedforstemmedfemoralcomponentsusedinthearthroplasty.Thispracticecoversproceduresfortheperformanceoffatiguetestsusing(asaforcingfunction)aperiodicconstantamplitudeforce.1.2Thispracticeappliesprimarilytoone-pieceprosthesesandfemoralstemswithmodularheads,withtheheadinplace.Suchprosthesesshouldnothaveananterior-posteriorA-Pboworamedial-lateralM-Lbow,andtheyshouldhaveanearlystraightsectiononthedistal50mmofthestem.Thispracticemayrequiremodificationstoaccommodateotherfemoralstemdesigns.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:E4PracticesforForceVerificationofTestingMachines2E466PracticeforConstantAmplitudeAxialFatigueTestsofMetallicMaterials2E467PracticeforVerificationofConstantAmplitudeDy-namicLoadsinanAxialLoadFatigueTestingMachine2E468PracticeforPresentationofConstantAmplitudeFa-tigueTestResultsforMetallicMaterials2E1150DefinitionsofTermsRelatingtoFatigue22.2ISODocument:3ISO7206-3(1988)StemTest3.Terminology(seeFig.1Fig.2)3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1cantileverplane—aplaneperpendiculartothelineofloadapplicationatthelevelonthe...
