The metacam + laser helped but the limp never went away for good. Surgery, understood. All I can say is his breathing is great. My vet would say something if she had any concerns. My uneducated self is leaning towards getting a second opinion - provided its ok to have another CT scan so soon - and trying the joint injection and more rest first.
If your vet is experienced with the breed, and putting them under than I would feel much better. Did he get put under the the CT scan as well? A second opinion would never hurt! It would at least confirm your next step.