This report deals with experience with the method of transurethral incision of urethral strictures under vision in 547 patients involving 662 internal urethrotomies between Nov. 1972 and Aug. 1977. Follow-up examinations showed good results in 79, 3% of the patients. Transurethral incision of urethral strictures can be recommended as the method of choice for the treatment of urethral strictures.

Although it is impossible to determine the occurrence of precipitation of solids in the urine tract, due to the statistical character of this process, the conditions of the resolution of the various minerals can be calculated exactly. Measurements of the solubility of calcium oxalate monohydrate as a function of the Mg, NaCl and citrate concentration of the urine prove the existence of complicated coupled chemical equilibriums. They cause magnesium salts to be ineffective in a resolution therapy of oxalate kidney stones. Instead of magnesium salts, sodium chloride and citrate ions are suitable for this purpose. The conditions concerned can be established exactly from the experimental results achieved.

From November 1972 to October 1974 190 patients of the ‘Urologische Klinik der Städt. Krankenanstalten Karlsruhe’ with urethral strictures were treated by internal urethrotomy under endoscopic control with the modified urethrotome from Stortz/Germany. This is a report about short-time results (2–14 months) after treatment. The method is very simple and the effect is controlled by endoscopy. In the first 44 patients we used general or lumbal anaesthesia. In the last patients only local anaesthesia by lnstillagel installation into the urethra was used. The short-time results were excellent in 66.8%. We believe that this method points out a new direction in the surgical treatment of urethral strictures.

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