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Recurrence rates increase with time with Shouldice as well. There’s a paper showing an increasing recurrence rate graph. It increases with time, but still stays under 2% if I remember correctly. I think this was based on Canadian insurance data for the Shouldice Hospital, so presumably independent data about the procedures performed there back then.
Studies of Shouldice performed elsewhere showed worse results, and who knows what more current results would be even at the Shouldice Hospital because the surgeons are different and they aren’t all adhering as strictly to the original way of doing it.