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1、Soft-tissuestabilizersoftheelbowMarcR.Safran,MD,andDavidBaillargeon,MD,SanFrancisco,CAElbowstabilityisaffordedbybothstaticanddynamicMEDIALSTRUCTURESstructures.StaticstructuresincludethecomplexbonyUlnar(medial)collateralligamentarchitectureandsoft-tissuestabilizers
2、.KnowledgeoftheanatomyandbiomechanicsofthestabilizersisAnatomy.Theulnarcollateralligament(UCL)com-importanttounderstand,diagnose,andtreatelbowplexisdividedintotheanteriorobliqueligament(AOL),theposteriorobliqueligament(POL),andtheinstability.Bonyanatomy,detailedel
3、sewhere,contrib-8transverseligament(Figure1).TheoriginoftheAOLutestotheinherentstabilityoftheelbow.ThestaticandPOLisfromthecentral65%oftheanteroinferiorsoft-tissuestabilizersconsistoftheanteriorandposte-31surfaceofthemedialepicondyle.Becauseitsoriginriorjointcapsu
4、leandbothmedialandlateralcollat-isslightlyposteriortotheaxisoftheelbow,thereisaeralligamentcomplexes.Additionalstabilityiscon-cameffectcreatedsothattheligamenttensionin-ferredbydynamicstructures—themusclescrossingthecreaseswithincreasingflexion.elbowjoint.(JShoulde
5、rElbowSurg2005;14:ThedifferentcomponentsoftheUCLhaveunique179S-185S.)andspecificcharacteristics.TheAOListhestrongest,39withameanloadtofailureof260N.TheAOLisINTRODUCTIONcomposedofthickparallelfiberswithameanwidthof64to5mm.TheAOLiscomposedof2anatomicTotreatelbowinstab
6、ility,onehastounderstandportionsand2functionalportions.Histologically,thecontributionsofthevariousstructuresinprovidingthereare2bandsoftheAOL,1withinthemedialstability.Theelbowisthesecondmostcommonlycapsuleand1onthesuperficialsurfaceofthecap-22dislocatedmajorjoint.
7、Instabilitymayoccurasasulethatalsoservesasapartialoriginoftheflexorresultofasingleeventsuchasafallonanout-45carpisuperficialis.TheAOLsitsundertheflexorstretchedhand,oritmaybeduetorepetitivestresscarpiulnaris.resultinginlaxityasaconsequenceofrepeatedval-Althoughthewho
8、leUCLgivesrestrainttovalgusgusforce,suchaswiththrowingintheoverheadandinternalrotatoryloads,theAOLisgenerallyathlete.thoughtofasbeingtheprimaryrestraint