POSTING FOR NVR (maybe he is out of posts) ???
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When we last discussed voluntary sterilization in this column
most physicians considered the procedure irreversible and thus permanent. However, medical developments in the last decade have changed the situation somewhat. For example, PopulationReports (November-December 1983, Johns Hopkins University) says about vasectomies: "In recent reports reversals have restored patency—that is, sperm have been found in the ejaculate—in 67 to 100 percent of men. Functional success—that is, pregnancies among the wives of men who have had reversals—has ranged from 16 to 85 percent." New surgical procedures and methods of implanting temporary blocks are also pointed to as indicating that reversal success will yet increase.