@Rezhio
It really depends on the execution, they don't need to constantly mention it, but it should have
some noticeable impact even without it being mentioned, like being unable to chase after enemies if he needs to, or catch up to people when he needs to, necessitating magic and the like. Maybe less of a reliance on physical ability, unlike him manhandling the wolves... The whole premise is that his knee injury is enough to make him consider retiring to some quaint quiet town for rest and relaxation after all, it'd be nice if these manga actually
used their interesting premises instead of dumping them or making them irrelevant as soon as possible.