glebetweenthelongaxisofthehumerusandalinethroughthephysisofthelateralcondyle.Normalα=75C80°exceptforsomeminorindividualdifferences,couldusecontralateralelbow.
Baumannbelievedthereciprocalangle（90-α）equalledthecarryingangle,notentirelytrue,butanglestillvalidformeasuringadequacyofreduction.
ThereisvariationamongtheOrthopaedictextbooksastowhichangleshouldbelabelled`Baumann'sangle.
Thisistheoriginalversionandthemostcommonlydescribedie.α
