WHILE excellent results have been reported with the use of both anticoagulant therapy and vein interruption in the treatment of postoperative thromboembolism,1 a wider experience with their application will have to be gathered before the comparative merits of these two methods can be definitely stated. In any such evaluation the presence, extent and permanence of the early and late sequelae associated with each method will have to be carefully weighed. As regards vein interruption, in spite of a rather large number of published accounts dealing with its use, accurate data on postligation complications and residuals are scarce.2 A follow-up survey of even a relatively small series of cases would, therefore, seem useful. Such a survey forms the main subject of this study. In addition to an analysis of clinical observations, certain facts obtained by special roentgenograms of the extremities will be recorded. MATERIAL Clinical Characteristics. —The cases under