AmputationLower ExtremityDiabetic FootAmputation, TraumaticAmputeesArtificial LimbsLegFoot UlcerMenAmputation StumpsVeteransPeripheral Vascular DiseasesDiabetes ComplicationsVascular Surgical ProceduresExtremitiesUpper ExtremityRetrospective StudiesUnited StatesTreatment OutcomeLimb SalvagePhantom LimbGangreneRisk FactorsLeg InjuriesIschemiaProspective StudiesDisarticulationFinger InjuriesToesArmArm InjuriesArterial Occlusive DiseasesReplantationFootPopliteal ArteryPodiatrySoft Tissue NeoplasmsReoperationDebridementTibial ArteriesSarcomaBones of Upper ExtremityPeripheral Arterial DiseaseVascular PatencyKneeFemoral ArteryVeinsLeg UlcerWound HealingTibia