On the Importance of Resection Length and Tension for Ureter End-to-End Anastomoses

40 end-to-end anastomoses in dogs were made, partially under considerable tension, in the lower part of the ureter after transverse division and after resection of segments between 3 and 10 cm. In three operative modifications the influence of resection length, tension, and microsurgical technique on the function of anastomoses was examined. As an equivalent to tension the approximation distance of the ends of the ureter was measured after resection of segments. Controls prove the superiority of the microsurgical procedure. In our experiments the resection length lies far above the reported maximum resection length of 3–5 cm. The results are not dependent on the resection length. There is every reason to believe that even the tension that lies on the anastomosis is not very important for the results.