Designation:F2723−13aStandardTestMethodforEvaluatingMobileBearingKneeTibialBaseplate/BearingResistancetoDynamicDisassociation1ThisstandardisissuedunderthefixeddesignationF2723;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesalaboratorymethodforevaluatingthepotentialformobilebearingkneetibialbaseplate/bearingdisassociationunderrepeatedforces.1.2Thetestdescribedisapplicabletoanybicompartmentalmobilebearingkneewithabearingretentionmechanism.Withmodification,thetestcanbeappliedtoaunicompartmentalmobilebearingkneewithabearingretentionmechanism.1.3Althoughthemethodologydescribeddoesnotreplicateallphysiologicalforceconditions,itisameansofinvitrocomparisonofmobilebearingkneedesignsandthestrengthofthebearingretentionmechanismbetweenthetibialbaseplateandbearingcomponentsunderthestatedtestconditions.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1Definitions:2.1.1bearingaxis—thelineconnectingthelowestpointsonboththelateralandmedialcondylesofthesuperiorsurfaceofthemobilebearing.2.1.2bearingretentionmechanism—mechanicalmeanspre-ventingtibialbaseplate/bearingdisassociation.2.1.3inferiorarticulatinginterfaces—anyinterfaceinwhichrelativemotionoccursbetweentheundersideofthemobilebearingcomponentandthetibialtray.2.1.4limitingposition—thepositionofthefemoralcompo-nentrelativetothebearingatwhichtheshearforceisatamaximumwithanterior-posterior(AP)movementofthefemo-ralcomponentonthebearing.2.1.5mobilebearing—thecomponentbetweenfixedfe...
