Yes IMO Grade 3 and 4 should have surgery to stop the luxation. I would ONLY hve a Board Cert. Ortho Surgeon do this though, as they have the experience, knowledge, skill and judgement when they are actually 'in there'
After the first week, they usually are back to normal ~ well at least in their little brains they are, and they do not understand, why oh why can't they be FREE (hahahahaha) ~ But because they have no idea that they just had major surgery, the 8 week containment healing period must be taken seriously, as they could re injury that leg or the other