old fantasy book about a barbarian with swords in place of his hands

I don't recall alot of details, except that it was world where fighting was very ritualized, and only done at certain buildings or waystations and with certain rules. The sword hand guy starts to create a society based around fighting. Slowly defeating other groups and growing his group.

I THINK it was both hands that got chopped off and replaced with swords or a sword/dagger combo. Would have been 70s or 80's I guess. Maybe older. Any help appreciated. Google no help at all.