AmputationLower ExtremityDiabetic FootLegFoot UlcerAmputeesArtificial LimbsMenAmputation, TraumaticVeteransPeripheral Vascular DiseasesDiabetes ComplicationsVascular Surgical ProceduresAmputation StumpsUnited StatesRetrospective StudiesTreatment OutcomeRisk FactorsUpper ExtremityExtremitiesLeg InjuriesLimb SalvageIschemiaGangreneBones of Lower ExtremityProspective StudiesPhantom LimbToesPeripheral Arterial DiseaseLeg BonesArterial Occlusive DiseasesVeinsTibial ArteriesDisarticulationArmKneeVascular PatencyPopliteal ArteryLeg UlcerFootFemoral ArteryArm InjuriesFinger InjuriesIntermittent ClaudicationFoot InjuriesWalkingReoperationFemoral Vein