External plasty of the pre-ostial valve is a surgical technique which has the aim of correcting reflux resulting from incompetence of the sapheno-femoral valve and at the time retaining the anatomical structure of the region. The artificial stenosis produced by external valvuloplasty of the pre-terminal valve complex has been studied in physical experiments, the first results of which already appear to be significant. The authors have operated upon 18 patients, with follow-up too short for the presentation of final results, but already sufficient to permit discussion of findings after a short period of time.