Well, since he is already under the ortho's care right now, I wouldn't worry about taking him in unless he has a problem, until his yearly visit. If he's in good health and doesn't have ongoing issues that require close monitoring and/or medication, yearly should be just fine. If it'll make you feel better, you can call your vet and let them know that he is still seeing the ortho for checkups and that you will be coming to his regular yearly in April
